Summary:
Initial hooks for reply to message
Per-message actions and reply to message!
Always commit changes before openinig popout composer
Flip message display - newest at bottom like Gmail
WIP specs
New activity bar inspector for deltas
Don't allow long polling connection to restart after end() called
A bit of activity bar refactoring and filter options, clear
Include "On ... someone wrote" in replies / fw
Slightly more robust quoted text removal, detects "On..."
Abort request to really end it
Additional specs for draft store
Test Plan: Run 20 new tests!
Reviewers: evan
Reviewed By: evan
Differential Revision: https://review.inboxapp.com/D1230
