Remove notification observers.
Hide navigation bar in viewWillAppear instead of viewDidAppear.
Make code more readable with early return.
Move UIColor category to categories folder.
Add UIColor category header to get rid of possible compiler confusion.
improvements for password view

- password strength was one character behind input
- reset password strength when second password does not match
- enforce reasonable password strength
improvements for password handling

- do not enforce password policy, only requires password to be existent (i.e. >0)
- added possibility to skip password protection
- automatically unlocks database if no password is set
improvements and enhancements for setting and entering passwords

- setting a password is now optional and informs user about iOS Data Protection
- do not enforce a password policy besides length > 0
- do not display entropy to user
- providing a switch to choose between PIN with numeric keyboard or alphanumeric passphrase
- store setting in UserDefaults to skip password entry (no password) or display numeric keyboard (PIN)
Add Travis CI configuration files
resolved storyboard merge conflict
git push origin masterMerge branch 'cbs-master'

password pin ability.
merging project file
git push origin masterMerge branch 'ursachec-cleanups'

merging PR.
Merge branch 'master' of https://github.com/dcestari/TextSecure-iOS into dcestari-master
git push origin masterMerge branch 'dcestari-master'

Travis CI support
Merge branch 'master' of github.com:WhisperSystems/TextSecure-iOS