Add done button to settings view controller.
Remove old ThreadViewController UI elements from storyboard.
Add new barebone version of the ThreadViewController.
Small cleanups and add threadVC to the TextSecureViewController.
Remove alert view asking for push notification registration.

- This may be a good idea to introduce after the UI is a bit more fleshed out,
now it’s a bit annoying to tap it away on every run
Add JSMessagesViewController as a pod instead of directly to the project.
Add ThreadViewController to the project file.