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'
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.
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
Poweruplover achievement
Fixed potential crash if RelationInfo should not exist, which I saw
once while a decline was in progress), started some minor refactoring.
Poweruplover achievement
Add patch to mention firing back in tutorial
Merge branch 'master' of https://github.com/gupascal/stk-code into gupascal-master
Fixed some merging issues.
Conflicts:
	data/achievements.xml
	src/achievements/achievement_info.hpp