remove unused cruft from Model class API
Model now knows its bounding radius
Adding per-palm penetration accumulator
Hands can collide with avatar head again
Merge upstream/master' into shapes branch
Merge upstream/master

Conflicts:
	interface/src/avatar/MyAvatar.cpp
degrees instead of radians for head lean deltas
Merge upstream master into "shapes" project
fixing signed/unsigned comparison
improved index sanity checking
merge upstream/master into "shapes" project

Conflicts:
	interface/src/avatar/MyAvatar.cpp
	interface/src/avatar/SkeletonModel.cpp
	interface/src/avatar/SkeletonModel.h
	libraries/avatars/src/HandData.h
	libraries/shared/src/SharedUtil.h
Merge branch 'cleanup' into 'shapes'
fix sphere-capsule collisions at the capsule caps
Adding StreamUtils for common debug output
Add penetration resolution helper for Hand class
merge upstream/master into physics project

Conflicts:
	interface/src/avatar/Hand.cpp
	interface/src/avatar/Hand.h
	interface/src/avatar/SkeletonModel.cpp
	interface/src/avatar/SkeletonModel.h
	interface/src/renderer/Model.h
Display warning popup when something went wrong with the fst upload
added more performance stats tracking to octree server
moved stopTrackingThread() to setIsShuttingDown() to reduce chance of object conflict
Merge branch 'master' of https://github.com/worklist/hifi into scaling_work