New mediacapture-main Editor's draft (v20151223)

Hi

A new dated version of the Editors' draft is available.

Dated version:
http://w3c.github.io/mediacapture-main/archives/20151223/getusermedia.html
Living document: http://w3c.github.io/mediacapture-main/

Changes include:
      o [#286] Fix facingMode in MediaTrackCapabilities and example
      o [#289] Describe the echoCancellation capability
      o [#290] Use single double instead of same max and min for the
      aspectRadio capability in example
      o [#291] Remove MediaStream active/inactive events
      o [#284] Clarify that constraint in overconstrainederror is
      defined in selectSettings
      o [#297] Add new extension text

Please review and provide feedback.

Dan (for the editors)