Methods were registered with wrong names

MOAIBox2DFrictionJoint._getMaxForce() -> getMaxForce()
MOAIBox2DFrictionJoint._getMaxTorque() -> getMaxTorque()
MOAIBox2DFrictionJoint._setMaxForce() -> setMaxForce()
MOAIBox2DFrictionJoint._setMaxTorque() -> setMaxTorque()
Changed C++ method names to fit Lua registration

MOAICpSpace::_insertProp() -> _insertPrim()
MOAICpSpace::_removeProp() -> _removePrim()

Seems like Patrick at some point renamed MOAIPrim to MOAIProp and
accidentally also renamed these methods although they deal in
MOAICpPrim's rather than MOAIPrim's.
Fixed method documentations
Fixed parameter documentation
Merge pull request #874 from DanielSWolf/doclint-fixes

Doclint fixes