Merge remote-tracking branch 'origin/develop'

merge

fixed OpenGLSystem crashing when querying invalid pixel coordinate

merge develop

merge

Merge branch 'develop' of github.com:phiste/kengine

optimized includes in SfSystem

made LuaCollisionSystem only use handlers instead of global table

added support for cameras to SfSystem + renamed MetaComponent to Grap…

…hicsComponent

Merge branch 'master' of github.com:phiste/kengine into develop