Fix up various interop issues (including CSeq sequencing and SUBSCRIBE dialogs). Includes Quaff 0.7.0.
Merge remote-tracking branch 'origin/master' into interop_enhancements

Conflicts:
	Gemfile
	Gemfile.lock
Interop fixes for the Gemini tests
Document new options
Merge pull request #74 from Metaswitch/interop_enhancements

[Reviewer: Andy] Interop enhancements
Merge remote-tracking branch 'origin/master' into custom_usernames

Conflicts:
	README.md