Summary:
atom-window `sendMessage` was not the same as `browserWindow.webContents.send`. WTF.
Save current namespace to config.cson so that it is never null when window opens
Don't re-create thread view on namespace change unless the namespace has changed
Tests for NamespaceStore state
Push worker immediately in workerForNamcespace to avoid creating two connections per namespace
Allow \n to be put into sreaming buffer, but only one
Clear streaming buffer when we're reconnecting to avoid processing same deltas twice (because of 400msec throttle)
Make `onProcessBuffer` more elegant—No functional changes
Test Plan: Run tests!
Reviewers: evan
Reviewed By: evan
Differential Revision: https://phab.nylas.com/D1551
