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
add new stats to OctreeServer
tweak to seeing load test
switch OctreeElementBag to use QSet as it's underlying data store
remove encode/deleting/start/done guards
added note
add more packet sending statistics to server
clean up formatting of sending stats
Simple class to download files (sync/async)
Merge branch 'master' of https://github.com/highfidelity/hifi into model_browsing
Merge branch 'master' of https://github.com/highfidelity/hifi into model_browsing