Icons for folders in new course documents viewer
Code formatting and cleaning
Removed AllCaps from subtitle of lists
New blue left arrow for back action in documents list
Fixed wrong date info in the  news list and course overview if it was added < 24h ago
Added temp hack to populate the back pressed action to the child fragments
Start loading attendees in onStart.
Major refactoring of the course documents section. This fixes #12

- The DB is not used anymore to prevent missing docs duo to DB
constraint fails
- Sometime missing filename fixed
- Navigate through the folder hierarchy
- Dedicated Folder and File icons
- Navigate Back with back button, header click or the back button list
entry
Version Bump
Merge branch 'dokuments_list_temp_fix'
Ignore dirty submodules
Submodule stuff