Rename
Change to named streams
Comments
Self calling works
Clean up unnecessary parameter
Actually save file
Clean up
Address Byron's comments
Merge pull request #278 from ekr/MS_named_streams_merge3

Ms named streams merge3
ice-lite support
ice-options is not allowed at the media level.

Also, don't do session-level fallback if the attribute type wasn't even
supposed to be at the media level in the first place.
ice-options support, and set ice-options:trickle
Rebase.