Bug 21967: Added paragraph on MediaStreamTrack enabled state and updated cloning algorithm.
Bug 22210: Make getUserMedia() algorithm use all numbered items.
Bug 22250: Fixed accidentally overridden error.
Bug 22211: Added async error when no valid media type is requested.
Bug 22216: Made NavigatorUserMediaError extend DOMError.
Bug 22249: Throw on attempts to set currentTime on media elements playing MediaStream objects.
Bug 22246: Made media.buffered have length 0.
Merge branch 'resolved_bugs'

Conflicts:
	getusermedia.html
Fixed change log after merge.