Update composer libraries, while enforcing the minimum php in composer.json (#10334)

* Enforce the Minimum PHP version in composer.json using "platform" feature
Added in https://github.com/composer/composer/commit/a57c51e8d78156612e49dec1c54d3184f260f144

It was found that this flag is very important to use to make sure the package we build and release will be compatible with this PHP version.
Otherwise, the minimum PHP version enforced would be the version where our build script runs, which could be PHP 5.5 or PHP 7 which would have caused serious issues.

* Update doctrine/cache, monolog,piwik/network, piwik/cache, piwik/php-tracker  etc.
https://github.com/piwik/piwik/issues/10058

* Release checklist to check that composer.json is correctly defined

* Use latest travis scripts for https://github.com/piwik/travis-scripts/commit/30d7b16940058a3dcea37dd7e7ed7241090bf57a

* .travis.yml file is out of date, auto-updating .travis.yml file.

* Use latest travis scripts for https://github.com/piwik/travis-scripts/commit/63445cf4a53e6e115a31ecacd79327dc5bfb2494

* .travis.yml file is out of date, auto-updating .travis.yml file.

5 files changed, 151 insertions, 111 deletions

diff --git a/.travis.yml b/.travis.yml
index 4e71a918e1..cbd288daa5 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -101,8 +101,8 @@ install:
 
   # travis now complains about this failing 9 times out of 10, so removing it
   #- travis_retry composer self-update
-
-  - '[ "$SKIP_COMPOSER_INSTALL" == "1" ] || travis_retry composer install'
+  - '[ "$SKIP_COMPOSER_INSTALL" == "1" ] || travis_retry composer install' 
+ 
 
 
 before_script:
diff --git a/composer.json b/composer.json
index e691f270b1..f92c15c833 100644
--- a/composer.json
+++ b/composer.json
@@ -18,21 +18,9 @@
         "wiki": "https://github.com/piwik/piwik/wiki",
         "source": "https://github.com/piwik/piwik"
     },
-    "autoload": {
-        "psr-4": {
-            "Piwik\\Plugins\\": "plugins/",
-            "Piwik\\": "core/"
-        },
-        "psr-0": {
-            "Zend_": "libs/",
-            "HTML_": "libs/",
-            "PEAR_": "libs/",
-            "Archive_": "libs/"
-        }
-    },
-    "autoload-dev": {
-        "psr-4": {
-            "Piwik\\Tests\\": "tests/PHPUnit/"
+    "config":{
+        "platform": {
+            "php": "5.3.3"
         }
     },
     "require": {
@@ -107,5 +95,22 @@
         "post-install-cmd": [
             "Piwik\\Composer\\ScriptHandler::buildXhprof"
         ]
+    },
+    "autoload": {
+        "psr-4": {
+            "Piwik\\Plugins\\": "plugins/",
+            "Piwik\\": "core/"
+        },
+        "psr-0": {
+            "Zend_": "libs/",
+            "HTML_": "libs/",
+            "PEAR_": "libs/",
+            "Archive_": "libs/"
+        }
+    },
+    "autoload-dev": {
+        "psr-4": {
+            "Piwik\\Tests\\": "tests/PHPUnit/"
+        }
     }
 }
diff --git a/composer.lock b/composer.lock
index 6a322faa68..f425e3edb3 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,8 +4,8 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
         "This file is @generated automatically"
     ],
-    "hash": "a51a1c88dd57ca43ed73ebc837c3c272",
-    "content-hash": "c9e1b12d01d2a5ff455b811e779fe1ae",
+    "hash": "e50915e8a908a57eb8111876fd084910",
+    "content-hash": "e83668fa3120ab4f766c150a82f01d9c",
     "packages": [
         {
             "name": "container-interop/container-interop",
@@ -104,16 +104,16 @@
         },
         {
             "name": "doctrine/cache",
-            "version": "v1.4.2",
+            "version": "v1.5.4",
             "source": {
                 "type": "git",
                 "url": "https://github.com/doctrine/cache.git",
-                "reference": "8c434000f420ade76a07c64cbe08ca47e5c101ca"
+                "reference": "47cdc76ceb95cc591d9c79a36dc3794975b5d136"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/doctrine/cache/zipball/8c434000f420ade76a07c64cbe08ca47e5c101ca",
-                "reference": "8c434000f420ade76a07c64cbe08ca47e5c101ca",
+                "url": "https://api.github.com/repos/doctrine/cache/zipball/47cdc76ceb95cc591d9c79a36dc3794975b5d136",
+                "reference": "47cdc76ceb95cc591d9c79a36dc3794975b5d136",
                 "shasum": ""
             },
             "require": {
@@ -134,8 +134,8 @@
                 }
             },
             "autoload": {
-                "psr-0": {
-                    "Doctrine\\Common\\Cache\\": "lib/"
+                "psr-4": {
+                    "Doctrine\\Common\\Cache\\": "lib/Doctrine/Common/Cache"
                 }
             },
             "notification-url": "https://packagist.org/downloads/",
@@ -170,7 +170,7 @@
                 "cache",
                 "caching"
             ],
-            "time": "2015-08-31 12:36:41"
+            "time": "2015-12-19 05:03:47"
         },
         {
             "name": "doctrine/lexer",
@@ -305,16 +305,16 @@
         },
         {
             "name": "monolog/monolog",
-            "version": "1.17.2",
+            "version": "1.20.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/Seldaek/monolog.git",
-                "reference": "bee7f0dc9c3e0b69a6039697533dca1e845c8c24"
+                "reference": "55841909e2bcde01b5318c35f2b74f8ecc86e037"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/Seldaek/monolog/zipball/bee7f0dc9c3e0b69a6039697533dca1e845c8c24",
-                "reference": "bee7f0dc9c3e0b69a6039697533dca1e845c8c24",
+                "url": "https://api.github.com/repos/Seldaek/monolog/zipball/55841909e2bcde01b5318c35f2b74f8ecc86e037",
+                "reference": "55841909e2bcde01b5318c35f2b74f8ecc86e037",
                 "shasum": ""
             },
             "require": {
@@ -329,13 +329,13 @@
                 "doctrine/couchdb": "~1.0@dev",
                 "graylog2/gelf-php": "~1.0",
                 "jakub-onderka/php-parallel-lint": "0.9",
+                "php-amqplib/php-amqplib": "~2.4",
                 "php-console/php-console": "^3.1.3",
                 "phpunit/phpunit": "~4.5",
                 "phpunit/phpunit-mock-objects": "2.3.0",
-                "raven/raven": "^0.13",
                 "ruflin/elastica": ">=0.90 <3.0",
-                "swiftmailer/swiftmailer": "~5.3",
-                "videlalvaro/php-amqplib": "~2.4"
+                "sentry/sentry": "^0.13",
+                "swiftmailer/swiftmailer": "~5.3"
             },
             "suggest": {
                 "aws/aws-sdk-php": "Allow sending log messages to AWS services like DynamoDB",
@@ -343,16 +343,17 @@
                 "ext-amqp": "Allow sending log messages to an AMQP server (1.0+ required)",
                 "ext-mongo": "Allow sending log messages to a MongoDB server",
                 "graylog2/gelf-php": "Allow sending log messages to a GrayLog2 server",
+                "mongodb/mongodb": "Allow sending log messages to a MongoDB server via PHP Driver",
+                "php-amqplib/php-amqplib": "Allow sending log messages to an AMQP server using php-amqplib",
                 "php-console/php-console": "Allow sending log messages to Google Chrome",
-                "raven/raven": "Allow sending log messages to a Sentry server",
                 "rollbar/rollbar": "Allow sending log messages to Rollbar",
                 "ruflin/elastica": "Allow sending log messages to an Elastic Search server",
-                "videlalvaro/php-amqplib": "Allow sending log messages to an AMQP server using php-amqplib"
+                "sentry/sentry": "Allow sending log messages to a Sentry server"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.16.x-dev"
+                    "dev-master": "2.0.x-dev"
                 }
             },
             "autoload": {
@@ -378,7 +379,7 @@
                 "logging",
                 "psr-3"
             ],
-            "time": "2015-10-14 12:51:02"
+            "time": "2016-07-02 14:02:10"
         },
         {
             "name": "mustangostang/spyc",
@@ -641,16 +642,16 @@
         },
         {
             "name": "php-di/invoker",
-            "version": "1.2.0",
+            "version": "1.3.3",
             "source": {
                 "type": "git",
                 "url": "https://github.com/PHP-DI/Invoker.git",
-                "reference": "9949fff87fcf14e8f2ccfbe36dac1e5921944c48"
+                "reference": "1f4ca63b9abc66109e53b255e465d0ddb5c2e3f7"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/PHP-DI/Invoker/zipball/9949fff87fcf14e8f2ccfbe36dac1e5921944c48",
-                "reference": "9949fff87fcf14e8f2ccfbe36dac1e5921944c48",
+                "url": "https://api.github.com/repos/PHP-DI/Invoker/zipball/1f4ca63b9abc66109e53b255e465d0ddb5c2e3f7",
+                "reference": "1f4ca63b9abc66109e53b255e465d0ddb5c2e3f7",
                 "shasum": ""
             },
             "require": {
@@ -680,7 +681,7 @@
                 "invoke",
                 "invoker"
             ],
-            "time": "2015-10-22 19:49:23"
+            "time": "2016-07-14 13:09:58"
         },
         {
             "name": "php-di/php-di",
@@ -741,16 +742,16 @@
         },
         {
             "name": "piwik/cache",
-            "version": "0.2.6",
+            "version": "0.2.7",
             "source": {
                 "type": "git",
                 "url": "https://github.com/piwik/component-cache.git",
-                "reference": "b8f2d18069c77726862f67d0199896d13073a831"
+                "reference": "7343e8b32da72f6ed50161c9c3b43ef8f5577cd6"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/piwik/component-cache/zipball/b8f2d18069c77726862f67d0199896d13073a831",
-                "reference": "b8f2d18069c77726862f67d0199896d13073a831",
+                "url": "https://api.github.com/repos/piwik/component-cache/zipball/7343e8b32da72f6ed50161c9c3b43ef8f5577cd6",
+                "reference": "7343e8b32da72f6ed50161c9c3b43ef8f5577cd6",
                 "shasum": ""
             },
             "require": {
@@ -784,20 +785,20 @@
                 "file",
                 "redis"
             ],
-            "time": "2015-09-29 16:50:32"
+            "time": "2016-07-20 23:26:18"
         },
         {
             "name": "piwik/decompress",
-            "version": "1.1.0",
+            "version": "1.2.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/piwik/component-decompress.git",
-                "reference": "deca40d71d29d6140aad39db007aea82676b7631"
+                "reference": "aa0a13f0ff44f70c736a72dd19ae1bcf400c6932"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/piwik/component-decompress/zipball/deca40d71d29d6140aad39db007aea82676b7631",
-                "reference": "deca40d71d29d6140aad39db007aea82676b7631",
+                "url": "https://api.github.com/repos/piwik/component-decompress/zipball/aa0a13f0ff44f70c736a72dd19ae1bcf400c6932",
+                "reference": "aa0a13f0ff44f70c736a72dd19ae1bcf400c6932",
                 "shasum": ""
             },
             "require": {
@@ -820,7 +821,7 @@
             "license": [
                 "LGPL-3.0"
             ],
-            "time": "2015-09-22 10:58:19"
+            "time": "2016-07-19 04:13:01"
         },
         {
             "name": "piwik/device-detector",
@@ -940,16 +941,16 @@
         },
         {
             "name": "piwik/piwik-php-tracker",
-            "version": "1.0.2",
+            "version": "1.0.3",
             "source": {
                 "type": "git",
                 "url": "https://github.com/piwik/piwik-php-tracker.git",
-                "reference": "f026613f8137c014030c96a22491ede5f5f1676b"
+                "reference": "eb4df1e223d4b377d06785c9b5fb3723d16d4465"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/piwik/piwik-php-tracker/zipball/f026613f8137c014030c96a22491ede5f5f1676b",
-                "reference": "f026613f8137c014030c96a22491ede5f5f1676b",
+                "url": "https://api.github.com/repos/piwik/piwik-php-tracker/zipball/eb4df1e223d4b377d06785c9b5fb3723d16d4465",
+                "reference": "eb4df1e223d4b377d06785c9b5fb3723d16d4465",
                 "shasum": ""
             },
             "type": "library",
@@ -976,7 +977,7 @@
                 "piwik",
                 "tracker"
             ],
-            "time": "2016-01-12 21:44:22"
+            "time": "2016-07-13 05:26:45"
         },
         {
             "name": "piwik/referrer-spam-blacklist",
@@ -1062,7 +1063,7 @@
         },
         {
             "name": "symfony/console",
-            "version": "v2.6.11",
+            "version": "v2.6.13",
             "target-dir": "Symfony/Component/Console",
             "source": {
                 "type": "git",
@@ -1120,7 +1121,7 @@
         },
         {
             "name": "symfony/event-dispatcher",
-            "version": "v2.6.11",
+            "version": "v2.6.13",
             "target-dir": "Symfony/Component/EventDispatcher",
             "source": {
                 "type": "git",
@@ -1179,7 +1180,7 @@
         },
         {
             "name": "symfony/monolog-bridge",
-            "version": "v2.6.11",
+            "version": "v2.6.13",
             "target-dir": "Symfony/Bridge/Monolog",
             "source": {
                 "type": "git",
@@ -1342,16 +1343,16 @@
         },
         {
             "name": "twig/twig",
-            "version": "v1.22.3",
+            "version": "v1.24.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/twigphp/Twig.git",
-                "reference": "ebfc36b7e77b0c1175afe30459cf943010245540"
+                "reference": "3566d311a92aae4deec6e48682dc5a4528c4a512"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/twigphp/Twig/zipball/ebfc36b7e77b0c1175afe30459cf943010245540",
-                "reference": "ebfc36b7e77b0c1175afe30459cf943010245540",
+                "url": "https://api.github.com/repos/twigphp/Twig/zipball/3566d311a92aae4deec6e48682dc5a4528c4a512",
+                "reference": "3566d311a92aae4deec6e48682dc5a4528c4a512",
                 "shasum": ""
             },
             "require": {
@@ -1364,7 +1365,7 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.22-dev"
+                    "dev-master": "1.24-dev"
                 }
             },
             "autoload": {
@@ -1399,7 +1400,7 @@
             "keywords": [
                 "templating"
             ],
-            "time": "2015-10-13 07:07:02"
+            "time": "2016-05-30 09:11:59"
         }
     ],
     "packages-dev": [
@@ -1798,30 +1799,32 @@
         },
         {
             "name": "phpspec/prophecy",
-            "version": "v1.5.0",
+            "version": "v1.6.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpspec/prophecy.git",
-                "reference": "4745ded9307786b730d7a60df5cb5a6c43cf95f7"
+                "reference": "58a8137754bc24b25740d4281399a4a3596058e0"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpspec/prophecy/zipball/4745ded9307786b730d7a60df5cb5a6c43cf95f7",
-                "reference": "4745ded9307786b730d7a60df5cb5a6c43cf95f7",
+                "url": "https://api.github.com/repos/phpspec/prophecy/zipball/58a8137754bc24b25740d4281399a4a3596058e0",
+                "reference": "58a8137754bc24b25740d4281399a4a3596058e0",
                 "shasum": ""
             },
             "require": {
                 "doctrine/instantiator": "^1.0.2",
-                "phpdocumentor/reflection-docblock": "~2.0",
-                "sebastian/comparator": "~1.1"
+                "php": "^5.3|^7.0",
+                "phpdocumentor/reflection-docblock": "^2.0|^3.0.2",
+                "sebastian/comparator": "^1.1",
+                "sebastian/recursion-context": "^1.0"
             },
             "require-dev": {
-                "phpspec/phpspec": "~2.0"
+                "phpspec/phpspec": "^2.0"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.4.x-dev"
+                    "dev-master": "1.6.x-dev"
                 }
             },
             "autoload": {
@@ -1854,7 +1857,7 @@
                 "spy",
                 "stub"
             ],
-            "time": "2015-08-13 10:07:40"
+            "time": "2016-06-07 08:13:47"
         },
         {
             "name": "phpunit/php-code-coverage",
@@ -2008,21 +2011,24 @@
         },
         {
             "name": "phpunit/php-timer",
-            "version": "1.0.7",
+            "version": "1.0.8",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/php-timer.git",
-                "reference": "3e82f4e9fc92665fafd9157568e4dcb01d014e5b"
+                "reference": "38e9124049cf1a164f1e4537caf19c99bf1eb260"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/php-timer/zipball/3e82f4e9fc92665fafd9157568e4dcb01d014e5b",
-                "reference": "3e82f4e9fc92665fafd9157568e4dcb01d014e5b",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-timer/zipball/38e9124049cf1a164f1e4537caf19c99bf1eb260",
+                "reference": "38e9124049cf1a164f1e4537caf19c99bf1eb260",
                 "shasum": ""
             },
             "require": {
                 "php": ">=5.3.3"
             },
+            "require-dev": {
+                "phpunit/phpunit": "~4|~5"
+            },
             "type": "library",
             "autoload": {
                 "classmap": [
@@ -2045,7 +2051,7 @@
             "keywords": [
                 "timer"
             ],
-            "time": "2015-06-21 08:01:12"
+            "time": "2016-05-12 18:03:57"
         },
         {
             "name": "phpunit/php-token-stream",
@@ -2290,28 +2296,28 @@
         },
         {
             "name": "sebastian/diff",
-            "version": "1.3.0",
+            "version": "1.4.1",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/diff.git",
-                "reference": "863df9687835c62aa423a22412d26fa2ebde3fd3"
+                "reference": "13edfd8706462032c2f52b4b862974dd46b71c9e"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/diff/zipball/863df9687835c62aa423a22412d26fa2ebde3fd3",
-                "reference": "863df9687835c62aa423a22412d26fa2ebde3fd3",
+                "url": "https://api.github.com/repos/sebastianbergmann/diff/zipball/13edfd8706462032c2f52b4b862974dd46b71c9e",
+                "reference": "13edfd8706462032c2f52b4b862974dd46b71c9e",
                 "shasum": ""
             },
             "require": {
                 "php": ">=5.3.3"
             },
             "require-dev": {
-                "phpunit/phpunit": "~4.2"
+                "phpunit/phpunit": "~4.8"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.3-dev"
+                    "dev-master": "1.4-dev"
                 }
             },
             "autoload": {
@@ -2334,24 +2340,24 @@
                 }
             ],
             "description": "Diff implementation",
-            "homepage": "http://www.github.com/sebastianbergmann/diff",
+            "homepage": "https://github.com/sebastianbergmann/diff",
             "keywords": [
                 "diff"
             ],
-            "time": "2015-02-22 15:13:53"
+            "time": "2015-12-08 07:14:41"
         },
         {
             "name": "sebastian/environment",
-            "version": "1.3.2",
+            "version": "1.3.7",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/environment.git",
-                "reference": "6324c907ce7a52478eeeaede764f48733ef5ae44"
+                "reference": "4e8f0da10ac5802913afc151413bc8c53b6c2716"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/environment/zipball/6324c907ce7a52478eeeaede764f48733ef5ae44",
-                "reference": "6324c907ce7a52478eeeaede764f48733ef5ae44",
+                "url": "https://api.github.com/repos/sebastianbergmann/environment/zipball/4e8f0da10ac5802913afc151413bc8c53b6c2716",
+                "reference": "4e8f0da10ac5802913afc151413bc8c53b6c2716",
                 "shasum": ""
             },
             "require": {
@@ -2388,20 +2394,20 @@
                 "environment",
                 "hhvm"
             ],
-            "time": "2015-08-03 06:14:51"
+            "time": "2016-05-17 03:18:57"
         },
         {
             "name": "sebastian/exporter",
-            "version": "1.2.1",
+            "version": "1.2.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/exporter.git",
-                "reference": "7ae5513327cb536431847bcc0c10edba2701064e"
+                "reference": "42c4c2eec485ee3e159ec9884f95b431287edde4"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/exporter/zipball/7ae5513327cb536431847bcc0c10edba2701064e",
-                "reference": "7ae5513327cb536431847bcc0c10edba2701064e",
+                "url": "https://api.github.com/repos/sebastianbergmann/exporter/zipball/42c4c2eec485ee3e159ec9884f95b431287edde4",
+                "reference": "42c4c2eec485ee3e159ec9884f95b431287edde4",
                 "shasum": ""
             },
             "require": {
@@ -2409,12 +2415,13 @@
                 "sebastian/recursion-context": "~1.0"
             },
             "require-dev": {
+                "ext-mbstring": "*",
                 "phpunit/phpunit": "~4.4"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "1.2.x-dev"
+                    "dev-master": "1.3.x-dev"
                 }
             },
             "autoload": {
@@ -2454,7 +2461,7 @@
                 "export",
                 "exporter"
             ],
-            "time": "2015-06-21 07:55:53"
+            "time": "2016-06-17 09:04:28"
         },
         {
             "name": "sebastian/global-state",
@@ -2509,16 +2516,16 @@
         },
         {
             "name": "sebastian/recursion-context",
-            "version": "1.0.1",
+            "version": "1.0.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/sebastianbergmann/recursion-context.git",
-                "reference": "994d4a811bafe801fb06dccbee797863ba2792ba"
+                "reference": "913401df809e99e4f47b27cdd781f4a258d58791"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/sebastianbergmann/recursion-context/zipball/994d4a811bafe801fb06dccbee797863ba2792ba",
-                "reference": "994d4a811bafe801fb06dccbee797863ba2792ba",
+                "url": "https://api.github.com/repos/sebastianbergmann/recursion-context/zipball/913401df809e99e4f47b27cdd781f4a258d58791",
+                "reference": "913401df809e99e4f47b27cdd781f4a258d58791",
                 "shasum": ""
             },
             "require": {
@@ -2558,7 +2565,7 @@
             ],
             "description": "Provides functionality to recursively process PHP variables",
             "homepage": "http://www.github.com/sebastianbergmann/recursion-context",
-            "time": "2015-06-21 08:04:50"
+            "time": "2015-11-11 19:50:13"
         },
         {
             "name": "sebastian/version",
@@ -2597,7 +2604,7 @@
         },
         {
             "name": "symfony/var-dumper",
-            "version": "v2.6.11",
+            "version": "v2.6.13",
             "target-dir": "Symfony/Component/VarDumper",
             "source": {
                 "type": "git",
@@ -2657,16 +2664,16 @@
         },
         {
             "name": "symfony/yaml",
-            "version": "v2.6.11",
+            "version": "v2.6.13",
             "target-dir": "Symfony/Component/Yaml",
             "source": {
                 "type": "git",
-                "url": "https://github.com/symfony/Yaml.git",
+                "url": "https://github.com/symfony/yaml.git",
                 "reference": "c044d1744b8e91aaaa0d9bac683ab87ec7cbf359"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/symfony/Yaml/zipball/c044d1744b8e91aaaa0d9bac683ab87ec7cbf359",
+                "url": "https://api.github.com/repos/symfony/yaml/zipball/c044d1744b8e91aaaa0d9bac683ab87ec7cbf359",
                 "reference": "c044d1744b8e91aaaa0d9bac683ab87ec7cbf359",
                 "shasum": ""
             },
@@ -2717,5 +2724,8 @@
     "platform": {
         "php": ">=5.3.3"
     },
-    "platform-dev": []
+    "platform-dev": [],
+    "platform-overrides": {
+        "php": "5.3.3"
+    }
 }
diff --git a/tests/PHPUnit/Integration/ReleaseCheckListTest.php b/tests/PHPUnit/Integration/ReleaseCheckListTest.php
index 67187046e1..265f60c372 100644
--- a/tests/PHPUnit/Integration/ReleaseCheckListTest.php
+++ b/tests/PHPUnit/Integration/ReleaseCheckListTest.php
@@ -28,6 +28,8 @@ class ReleaseCheckListTest extends \PHPUnit_Framework_TestCase
 {
     private $globalConfig;
 
+    const MINIMUM_PHP_VERSION = '5.3.3';
+
     public function setUp()
     {
         $iniReader = new IniReader();
@@ -36,6 +38,21 @@ class ReleaseCheckListTest extends \PHPUnit_Framework_TestCase
         parent::setUp();
     }
 
+    public function test_minimumPHPVersion_isEnforced()
+    {
+        global $piwik_minimumPHPVersion;
+        $this->assertEquals(self::MINIMUM_PHP_VERSION, $piwik_minimumPHPVersion, 'minimum PHP version global variable correctly defined');
+    }
+
+    public function test_minimumPhpVersion_isDefinedInComposerJson()
+    {
+        $composerJson = $this->getComposerJsonAsArray();
+        $this->assertEquals(self::MINIMUM_PHP_VERSION, $composerJson['config']['platform']['php']);
+
+        $expectedRequirePhp = '>=' . self::MINIMUM_PHP_VERSION;
+        $this->assertEquals($expectedRequirePhp, $composerJson['require']['php']);
+    }
+
     public function test_icoFilesIconsShouldBeInPngFormat()
     {
         $files = Filesystem::globr(PIWIK_INCLUDE_PATH . '/plugins', '*.ico');
@@ -605,8 +622,7 @@ class ReleaseCheckListTest extends \PHPUnit_Framework_TestCase
      */
     private function getComposerRequireDevPackages()
     {
-        $composer = file_get_contents(PIWIK_INCLUDE_PATH . '/composer.json');
-        $composerJson = json_decode($composer, $assoc = true);
+        $composerJson = $this->getComposerJsonAsArray();
         $composerDependencyDevOnly = array_keys($composerJson["require-dev"]);
         return $composerDependencyDevOnly;
     }
@@ -752,5 +768,14 @@ class ReleaseCheckListTest extends \PHPUnit_Framework_TestCase
         return stripos($file, "/tests/") !== false;
     }
 
+    /**
+     * @return mixed
+     */
+    private function getComposerJsonAsArray()
+    {
+        $composer = file_get_contents(PIWIK_INCLUDE_PATH . '/composer.json');
+        $composerJson = json_decode($composer, $assoc = true);
+        return $composerJson;
+    }
 
 }
diff --git a/tests/travis b/tests/travis
-Subproject e6a2e9eba8e475ac47298b0676b14983043ddb8
+Subproject 63445cf4a53e6e115a31ecacd79327dc5bfb249