Fix bug in URDF loader that caused revolute joint limits to not be loaded.
Remove Skeleton::setWorldTransform because the world transformation of body node should be updated by dynamics algorithm not by the user.
[#108] Remove BodyNode::getWorldInvTransform()
Merge branch 'origin/master'
Merge pull request #107 from dartsim/set_worldtransform

Remove Skeleton::setWorldTransform
Merge branch 'remove_getinvworldtransform'
Merge branch 'origin/master'