Update Android WebRTC libraries to r6560
PhoneRTCPlugin.java: implement updateVideoPosition
phonertc.js: export updateVideoPosition for manual usage

For example, applications can handle orientation changes as follows:

  window.addEventListener("orientationchange",
    cordova.plugins.phonertc.updateVideoPosition);
VideoStreamsView.java: don't rotate video when rendering
Merge pull request #24 from joseph-onsip/master

Update Android WebRTC libraries to r6560