Add more specific timing data to peerconnection sample.

Add enough traces to allow us to accurately determine how long it takes
to set up a call.
Add callbacks for ICE states and other changes useful for determining
timing.
Merge pull request #21 from fischman/master

Remove http: scheme from googlefonts links to avoid HTTPS/HTTP mismatches
Remove space
Curry callbacks, fix muting bug.
Try this
Doubles to single quotes
And that's why you always test your merge resolves
Merge pull request #19 from juberti/pc1

Add more specific timing data to peerconnection sample.