MYGUIDE-335 part 1

- create new list adapter
- create fragment with nearest animals
- create fragment showing nearest animal at the bottom of the sightseeing screen
- add placeholder image
- add necessary layouts and strings

TO DO:
- behavior when location is unknown (hoping for @hammer814 to add lastLocation variable in his next PR, then check if it's a null);
- drawing path on the map when animal is picked;

NEEDS FIXING:
- application crashes when coming back from NearestAnimalsListFragment to SightseeingFragment; such thing doesn't occur when another fragment is picked between them from sliding menu.