+ Finished Picker (customizer)

+ Finished AppNavigator
+ SelectUserFragment - is now retainFragment
+ Fixed many errors
+ Added constants file
+ Added styles for Android 4-
+ Added internal cache support

TODO:
- !Add progressBar to CustomizeFragment
- !Send images and name to SelectUser
- Support Tablets (dualpane mode)
- Memory optimizations
- Picker - add Added/Remaining Count TextView
- Proper error hadle (onFail callback)

- Add SplashScreen with collage made by app
- Enlarge ActionBar icon
- Implement share vie Social Networks (FB, VK etc)
- Tests

- remaining TODOs in code

LATER:
- Javadoc refine