Settings: Start UI work on #208
Signup enhancements.

- Remove unused segue
- Add call to super
Archive/Inbox: Unread layout and other enhancements

- Add lastAction indicator for errors and info in TSThreadViews
- Enable unarchiving and deletion from archive.
- Unread message layout
Messages view fixes

- Delivered tag
- Fix tap to resend recognizer
- Error messages layout

Reviewed-by: @FredericJacobs
Fixing crash in MessagesViewController.
Merge branch 'textSecure' of https://github.com/WhisperSystems/Signal-iOS into textSecure
Bug fixes in MessageViewController

- Messages shouldn’t be marked as seen if app in background
- Fixes crash on first delivery receipt
Merge branch 'textSecure' of https://github.com/WhisperSystems/Signal-iOS into textSecure
Settings: Basic wiring for notification styles
MessagesVC: Tapping error messages