Toggle help bubble message between Mute and Unmute peer's audio + test it
Improve readability + speed up tests
Allow the SPA to accept & expose capabilities
Rename Conversation.data to Conversation.context for clarity.
Store SPA capabilities in the Conversation.

- Store the capabilities in the SPA wrapper.
- Construct Conversation using the SPA wrapper.
- Store SPA capabilities within the Conversation.
ChatApp stores received SPA capabilities.
Use model attributes to store capabilities.
Add a "supports" method to the Call model.
Updated CallControlsView to show/hide call move button.
Added initiate-move event

- added call move button event listener
- initiate-move event triggering & forwarding to the the worker and the SPA
updated TalkillaSPA to accept an options object
Fixed broken call to appPort#post
Fixed removal of explicit json serialization of offer payload.
Merge pull request #326 from ametaireau/call-move-support

Call move support
Merge pull request #324 from bgdnc/Toggle-mute-and-unmute-peers-audio-message

Toggle help bubble message between Mute and Unmute peer's audio, r=@dmose
Remove toJSON calls on payloads where it isn't necessary
Stop trying to force the payloads.offer object into what the conversation window needs, by providing an explicit structure
Better semantics for SPA message payload mapping.
Added move-accept SPA event payload & handling.
Added support for call termination on move-accept event received.