added test case for adding a second stream to a running call and renegotiate
Merge pull request #124 from docfaraday/multistream_unit_tests

Multistream unit tests
fixed compiler errors and warnings
Merge pull request #125 from nils-ohlmeier/renegotiation

added test case for adding a second stream to a running call and renegot...
Get a bunch of test cases passing in signalling_unittests. Still needs
the media stuff wired up.
Tiny ws fix.