New API: WebTorrent.WEBRTC_SUPPORT

Detect native WebRTC support in the environment.

```js
if (WebTorrent.WEBRTC_SUPPORT) {
  // webrtc support!
} else {
  // fallback
}
```

1 files changed, 15 insertions, 0 deletions

diff --git a/test/node/basic.js b/test/node/basic.js
index b225b8d..6bee61c 100644
--- a/test/node/basic.js
+++ b/test/node/basic.js
@@ -3,6 +3,21 @@ var http = require('http')
 var test = require('tape')
 var WebTorrent = require('../../')
 
+test('WebTorrent.WEBRTC_SUPPORT', function (t) {
+  t.plan(2)
+
+  var client = new WebTorrent({ dht: false, tracker: false })
+
+  client.on('error', function (err) { t.fail(err) })
+  client.on('warning', function (err) { t.fail(err) })
+
+  t.equal(WebTorrent.WEBRTC_SUPPORT, false)
+
+  client.destroy(function (err) {
+    t.error(err, 'client destroyed')
+  })
+})
+
 test('client.add: http url to a torrent file, string', function (t) {
   t.plan(8)