+ Implemented Picker (customizer)

+ Added landscape mode to picker
+ Remade fragment navigation

TODO:
- Memory optimizations
- Finish picker (check for seekBar, additional textView for remaining images, send full list with boolean array)
- Finish fragment navigation (AppNavigator class)
- Proper error hadle (onFail callback)
- Styles (styles.xml refine)
- set Select user - retaininstance
- Add SplashScreen with collage made by app
- Enlarge ActionBar icon
- Implement share vie Social Networks (FB, VK etc)
- Tests
- Javadoc
- error setAdapter after going to landscape mode on selectuser fragment
- remaining TODOs in code
- Constants file