Provide normal C++11. Add -I for MediaTests.
Add simple playlist class and 2 tests.

 * Playlist saves tracks as vector<MediaFiles*>;
 * Playlist doesn't delete MediaFiles* in dtor;
 * Playlist has method for:
   - adding tracks;
   - getting size of track collection;
   - getting track by index.
 * Add 2 tests
   - on empty constructor;
   - on adding 10 tracks;
Replace using auto_ptr on shared_ptr in tests.