Add left-arm movement to remote avatars without changing network packet structure.
Move MyAvatar leap hand arm-movement into Avatar::updateLeapHandPositions(), to enable remote avatars to position fingertips and IK-arms based on Leap hand data.
Merge pull request #1064 from ey6es/skinny

Skin the Faceshift models so that they bend at the neck rather than rotating around.  Also, fix various material parameters and apply per-pixel lighting.
Merge pull request #1065 from machinelevel/dev4

Add left-arm movement to remote avatars without changing network packet structure