[ios] Tweaked appearance of navigation bar on mail screen.
[android] Add missing manifest entries to make parse push work.
Changed Android intents.
[android] Various push notification things:

- use Actions instead of Channels to determine which page to open.
- use a small, white push notification icon, conforming to the
  style guide.
- drop the `packageNameSuffix` for debug builds, because it inter-
  feres with the push message receiver component.
Merge branch 'master' into feature/parse-push