[webrtc-extensions] new commits pushed by aboba

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

* fix spelling of HeaderExtensionsNegotiated slot

and remove a spurious backslash.
  by Philipp Hancke
https://github.com/w3c/webrtc-extensions/commit/56252d513ae5859d449a14d934d5386fbaa2ca1e

* Merge pull request #129 from fippo/fix-spelling

editorial: fix spelling of HeaderExtensionsNegotiated slot
  by Bernard Aboba
https://github.com/w3c/webrtc-extensions/commit/648734da0d1dea4fa839a4435588b4fee0bf330e



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