Put hash, multi_hash and event_stream namespaces in Containers documentation module
Log on pause()/unpause()
Update core/json documentation
Use version from CMakeLists.txt when generating documentation
Update MathUtils.h documentation
Switch World, PhysicsWorld, SoundWorld, ResourcePackage to fulluserdata. Also provide a macro-based mechanism to add type checking to lightuserdata objects. Also simplify LuaSystem and do not export lua binding functions.
Merge branch 'master' of https://github.com/taylor001/crown