Adding media section addition code
Merge pull request #50 from adamroach/attributes

Serialization is code complete (except ftmp and imgattr)
Merge pull request #49 from martinthomson/sdpwrap

Adding media section addition code
All tests pass
Fixing build mess
Merge pull request #51 from martinthomson/sdpwrap

All tests pass
Now with propertly formatted m-lines!