Added loading indicator. Did some refactoring.
...
Merge remote-tracking branch 'upstream/master'

Conflicts:
	src/de/fuelmeup/CarMapFragment.java
	src/de/fuelmeup/rest/Client.java
Fixing build.gradle
Added iml file to git
Restructured project
Setup dagger. Use mock api service for testing.
Add build variant for unit tests
Added injection support for preferences
Increased gradle and build tools versions
Use custom map fragment to allow mockito usage in dagger module
Added custom seekbar on map to define fuel level
Added observable for seekbar progress. Code cleanup.
Styled actionbar and icons
Styled actionbar items
Recluster after adding/removing markers to map
Request cars from all cities
Finished car map presenter unit tests
Deleted obsolete files. Added nice settings icon.
Renewed screenshot