Merged internal and public PeerConnection classes
PeerConnection class now implements the W3C EventTarget interface
Merge branch 'develop' into merge_classes

Conflicts:
	package.json
Unified DataChannel internal and public classes
RTCDataChannel now support EventTarget interface
Unified MediaStream public and private classes
Unified public and private classes of MediaStreamTrack
Merge https://github.com/js-platform/node-webrtc into merge_classes
Updated version of eventtarget to ~0.0.1 to fix error in NPM registry
Merge pull request #84 from ShareIt-project/merge_classes

Merged internal and public PeerConnection classes