Added simple script that makes all challenges trivial
(0 laps, no time or energy limit).
Update CMakeLists.txt

This commit includes checking whether ../data directory (from build directory) and ../../stk-assets directory (from build directory) exists or not. If they don't exist, then it gives error message for the corresponding directory. I have included the code for this on line 320.
Update CMakeLists.txt
added achievement banana lover
added an achievement banana lover
merged code with upstream master
Adding a Wiimote with other one alredy placed - Bug: #1209 fixed
Now IA don't fire a cake if the kart is driving too slow. Also correct some comments.
Skidding achievement
Wrong include corrected (\ -> /).
Drift counting fixed.
Tab fix
Bring back minimap.
Start working on instancing library node
Merge remote-tracking branch 'remotes/upstrem/master' into skiddingAI
Don't fire a cake if the target kart is driving too slow.
Add initial basic support for loading instancing nodes
Merge branch 'master' into Instancing
Merge instanced_object_pass vertex shaders.
Clean code to make it extendable later
Some fixes.