replace auto_ptr by unique_ptr as auto_ptr is deprecated
Merge remote-tracking branch 'upstream/master'
#1156, fix quotes in CMakeLists files, see http://cmake.org/Wiki/CMake/Language_Syntax#Quoting for more info
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Skidding achievement
Now IA don't fire a cake if the kart is driving too slow. Also correct some comments.
Add a new Gold Driver achievement.
Merge remote-tracking branch 'upstream/master'
Fix a build issue for Travis CI.
Wrong include corrected (\ -> /).
Drift counting fixed.
Tab fix
Merge pull request #1243 from mcsab/master

Skidding achievement
Bring back minimap.
revert unique_ptr back to auto_ptr
removed unused functions
Revert "Now IA don't fire a cake if the kart is driving too slow. Also correct some comments."

This reverts commit 9030291340cff5f1786267034cb2040d2088aa8e.
Clean up some minor coding style issues
Allow karts to specifie a different sound effect for their engine; closes #1234
having fun reverting changes