add Ragdoll::_accumulatedMovement
use relative mass when enforcing ContactPoint
make SkeletonRagdoll::updateMuscles() protected
compute and store Ragdoll::_accumulatedMovement
use Ragdoll::_accumulatedMovement to move MyAvatar
add VerletPoint::shift()
Merge branch 'ragdoll' of ssh://github.com/AndrewMeadows/hifi into ragdoll
merge upstream/master into andrew/ragdoll
Merge pull request #3295 from AndrewMeadows/ragdoll

Ragdoll Part 11: ragdoll collisions move avatar