* Add UI test for JavaScript tracking.
* apply some review feedback
* try to fix UI test on travis
* Add missing screenshot.
* Normalize JSTracker UI test result.
* update screenshot
* Make matomo.js and matomo.php the default Tracking API endpoints used
* few fixes
* fix few tests
* update matomo php tracker in composer
* make sure to record install version
* do not overwrite ever install version
* trying to fix test
* more tweaks and fix tests
* prefer matomo endpoint in the ui, fix some tests
* file was still needed
* apply review feedback
* fix ui tests
- Make 'idsite' parameter in certain Overlay URLs 'idSite'.
- Make sure Overlay sidebar has width so screenshot test framework can find position.
- Add overlay test site so Overlay can be loaded in phantomjs.
- Remove createSuperUser call from TrackerTest (done in Fixture setUp).
- Make sure piwik.js link is created for screenshot tests & make sure the test environment JSON file is loaded after the database is setup.
- Modify logic that waits for images to load in screenshot testing framework's page renderer to wait for CSS image URLs.