Merge pull request #44 from erwincoumans/master

make GLUT optional in cmake
reduce mouse picking strength
fix a nasty bug, due to uninitialized variable, sometimes the value was nan and the == passed, leading to some OpenGL error later on due to glScissors failing…
Merge pull request #1 from bulletphysics/master

update to latest
Merge remote-tracking branch 'upstream/master'