Set up gear button HTML, CSS, and test scaffolding
Minor CSS clarity tweaks
Get CSS and menu working
Misc CSS cleanups
More CSS cleanups
Remove dev scaffolding; hide menu for now
Change placeholder id for clarity
Change gear tooltip based on review comments and discussion with Boriss
Add Hold and Resume message sending from SPA to Conversation Window
Merge pull request #329 from dmose/gear-menu

Adds (currently hidden, but soon-to-be-needed" gear menu, r=@ametaireau
Add a call state for hold, and handle the hold and resume messages, and muting of streams
Add notifications for a call being on hold; fix setting mute state
Fix lint failures
Handle correct hiding of the video and showing the text messages when a call is on hold.
Implement the TalkillaSPASetup class
Open an iframe when setting up the Talkilla SPA
Listen for the SPA enabling from the iframe
Remove dead code
Try Fix Travis failures in frontend chat tests.
Fix functional tests