Backfill streaming events for protocol v4, handling disconnection and deviceDisconnection
Allow emission of deviceStopped/deviceRemoved/streamingStopped upon manual disconnection.
Fix issue where focus changes while disconnect would cause focus not to be sent while connected.
Speed up refocus detection by 100ms
Decrement protocols more quickly
Merge pull request #173 from leapmotion/backfill-deviceEvents

Backfill device events