Initial try.
Merge branch 'database' into mediaplayer

Conflicts:
	src/se/chalmers/mindy/core/MainActivity.java
Resolved merge conflicts.

Resolved merge conflicts.
Added a top margin to navigation drawer

Added a top margin to navigation drawer, in order to avoid it extending
into the transparent action bar.
Further database implementation

Implemented evaluation question and answer tables in database. Add and
fetch methods remain to be added.
Merge branch 'mediaplayer' into database