Remove "fromBind" arg in Model::setJointRotation

It was always set 'true'.
merge upstream/master into andrew/inertia
Make JointState a proper class

JointState gets a pointer to its corresponding FBXJoint
cleaner initialization of JointState
add JointState::updateWorldTransform()
merge upstream/master into andrew/inertia
Merge pull request #2946 from AndrewMeadows/inertia

cleanup: JointState transitions toward a proper class