Merge pull request #51 from martinthomson/sdpwrap

All tests pass
Checkpoint: AddTracks()
Checkpoint
Create world's lamest offer
Waiting for MT
Added file
Deunify for the win
Checkpoint
Fix reference
Now with propertly formatted m-lines!
JSEP tests pass
Because "1" isn't a valid "o=" line
Merge pull request #52 from adamroach/attributes

Now with propertly formatted m-lines!
Fix spurious whitespace change
Merge pull request #54 from ekr/MS_create_offer2

Ms create offer2
Fingerprint parse stuff.
Wire up protocol for m-lines, and wire up accessors for setup.
Add some more accessor code.
Fix double-increment.
Don't create an empty fingerprint container if we have some
fingerprints, none of which we support. Also, flesh out the setup test
case.