[webrtc-stats] new commits pushed by alvestrand

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

* add missing fields to candidate stats (#611)

* RTCIceCandidate: add tcpType

as as defined as in [webrtc-pc](https://w3c.github.io/webrtc-pc/#dom-rtcicecandidate-tcptype)

Not terribly important but i wanted it to show a nice candidate grid from statistics

* cross-document references are nice

* add missing fields
  by Philipp Hancke
https://github.com/w3c/webrtc-stats/commit/4c62b1075124091c26bdcd75ff8cf67d83030539



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