initial tracking infrastructure
Merge branch 'master' into tracking
add GUM tracking
Merge branch 'master' into tracking

Conflicts:
	index.html
Merge branch 'master' into tracking

Conflicts:
	index.html
Fixes simulcast layers ordering.
Merge pull request #128 from jitsi/tracking

Tracking
work around https://code.google.com/p/webrtc/issues/detail?id=3807
add missing tracking.js to #128
Fixes bug with shortcuts enabled when the user is writing in a text field.
Makes the remote video shortcut 0.
Merge pull request #129 from fouksf/keyboard-shortcuts

Fixes bug with shortcuts enabled when writing display name.
Fixes a mistake in the video switching shortcuts.
Fixes bug with trailing tooltips after participant is unmuted. #130
Merge pull request #131 from fouksf/keyboard-shortcuts

Fixes a mistake in the video switching shortcuts.
Merge pull request #132 from fouksf/trailing-tooltips

Fixes bug with trailing tooltips after participant is unmuted. #130
Adds forgotten, but necessary for simulcast, modifications to libs/strophe.jingle.sessionbase.js.
Implements first version of adaptive simulcast.
Adds a message handler and messages to the user including when the video bridge is not available.