Fix offer/answer order
Merge pull request #122 from docfaraday/multistream_unit_tests

Remove some MOZ_CRASH that were unneccesary, and convert some others to
ICE checks pass for audio
Merge pull request #123 from ekr/MS_setup_ice

Wire up ICE. ICE now connects at least in trivial cases.
Use -Werror if configured to do so.
Get signaling_unittests to run all the way through without crashing.