improved hand holding algorithm
added 'isCollidable' to avatar bone so that some bones do not collide (for handshaking)
Merge remote-tracking branch 'upstream/master'
add debug to avatar mixer to figure out invisible avatars
Merge pull request #162 from Ventrella/master

improved hand holding algorithm
remove added debugging in avatar-mixer, light refactoring
simplify the avatar mixer communication while publicly accessible
remove the unused avatarIndex variable
avatar mixer still needs to check in with DS
I think this is the least intrusive fix for the chat crashes: lock the agent
list when we're updating from the network, simulating, or rendering.  I think
there are likely to be other synchronization issues, but this is a start.
Merge branch 'master' of https://github.com/worklist/hifi
Merge pull request #164 from ey6es/master

To fix chat crash, lock agent list when updating from network, simulating, or rendering.
Merge pull request #163 from birarda/no-avatars

remove half-baked ping reply setup from avatar mixer
agents added to avatar-mixer are of type avatar