- Multi browser support (first approach).
- JsSIP.Utils.isWebRtcSupported() moved to JsSIP.WebRTC.isSupported().
Hack window.RTCSessionDescription into JsSIP.WebRTC.RTCSessionDescription (compatibility).
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Remove JsSIP.Utils.isWebRtcSupported method (which was already commented in this branch).
Remove unnecesary global variables
Added support for browsers other than Chrome