[webrtc-stats] new commits pushed by alvestrand

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

* Bandwidth estimations again (Issue 97 redux) (#182)

* addressing review comments from @alvestrand and @taylor-b

* s/sent/received

* updated based on feedback
  by Varun Singh
https://github.com/w3c/webrtc-stats/commit/afc9cca8cc56eba62eca798895af6e4008ce4af5