changed AudioMediaStreamTrack to RTCDTMFSender and updated it
Fixed exmple that used the old MediaStream.audioTracks attribute.
Replaced the localStreams and remoteStreams attributes with functions returning sequences of MediaStream objects.
DTMF updates
fixed merge conflict
Added a getStreamById() method (with note).
updated state transtion diagrams and state enums
clean up state diagram formatting
Merge branch 'master' into state-update-dec-2012
changing signalling state name
changing ice state name
updated state names in algo sections
updated algorithm, added some descriptions for dtmf
Added spec text for attributes and methods adopted from the WebSocket interface.
nullable dictionary can't be used as operation arguments; marking MediaConstraints as optional is sufficient anyway and consistent with other calls
replacing RTCVoidCallback by WebIDL-defined VoidFunction
can't use nullable dictionary RTCConfiguration / MediaConstraints in updateIce; marking MediaConstraints arg explicitly as optional
removed INVALID_SUCCESS_CALLBACK and INVALID_FAILURE_CALLBACK since they're redundant with WebIDL Type Mimatch exception
removed more redundant exception types that duplicate WebIDL TypeError, but left the ones for which the spec is less clear on whether it is indeed a duplicate
merged in state-update-dec-2012