added test case for adding a second stream to a running call and renegotiate
Use -Werror if configured to do so.
Get signaling_unittests to run all the way through without crashing.
Wire up (some of the) offer options, get more of signaling_unittests
passing.
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...