No bug - Fix warnings. r=trivial
Bug 984723 - Part 1: tweak FxA Sync intervals.
Bug 984723 - Part 2: rename POLL_INTERVAL_MINIMUM_SEC to SYNC_INTERVAL_MINIMUM_SEC.
Bug 984723 - Part 3: add a second policy for background syncs.
Bug 984723 - Part 4: fix naming of constant.
Review comments.
Bug 984723 - Adjust scheduling. r=nalexander
Bug 986096 - Finish activity when clicking Back to Browsing, don't add to history.
Bug 986096 - On access to Sync through settings after setup, user should be sent to config screen not 'back to browsing'. r=nalexander
Bug 957894 - Pre: Remove outdated comments.
Bug 957894 - Part 1: Add fxa account pickling code.
Bug 957894 - Part 2: Test AccountPickler.
Bug 957894 - Part 3: Pickle on sync.
Bug 957894 - Part 4: Unpickle in accountsExist.
Bug 957894 - Part 5: Add deletePickle test.
Bug 957894 - Part 6: Delete pickle when removing account.
FOLD: Add FXA deleted account receivers.
FOLD: Broadcast account deletion.
Bug 957894 - Post: Remove unused imports.
Bug 957894 - Part 7: Update documentation (part 1).