eNIS

Invalid date

- Now app can be safely launched in Android <5.0 without crashing - I am sorry for that issue.
- Now the app has embedded gallery to use when you are adding images to homework. Also, you can open camera quickly by tapping camera button in gallery.
- Fixed a tons of bugs.
- Removed time settings from schedule, because it was useless.
- Added new 'Birthday' module, where you can see your friend or teacher's birthday date.