[webrtc-svc] new commits pushed by aboba

The following commits were just pushed by aboba to https://github.com/w3c/webrtc-svc:

* Case Sensitivity of scalability modes

Fix for Issue https://github.com/w3c/webrtc-svc/issues/32
  by Bernard Aboba
https://github.com/w3c/webrtc-svc/commit/2866f72da4982f4ed37c3f560d9317d7dea626c1

* Grammar fix
  by Bernard Aboba
https://github.com/w3c/webrtc-svc/commit/149e24403d9a31329444760b3a23cb50bc8e9317

* Merge pull request #33 from w3c/aboba-patch-15

Case Sensitivity of scalability modes
  by Bernard Aboba
https://github.com/w3c/webrtc-svc/commit/3f3a21daee8234d4aed19cbd5f96f428bc374f68