Merge pull request #1965 from AndrewMeadows/avatar-interaction

Avatar interaction first pass
Ignore the =1's that Faceshift appends to our custom data in the FST.
Provide a means to specify a fallback for when we fail to load a model.  Also
added missing associated resources for default model.  Closes #1960.
Merge branch 'master' of https://github.com/highfidelity/hifi
Merge pull request #1971 from ey6es/master

Ignore extra "=1"'s that Faceshift appends to FST files, fall back to default head/body on failure to load.
Fix for #1968: head does not roll
Merge branch 'master' of ssh://github.com/highfidelity/hifi into fix-mouselook
Merge pull request #1976 from AndrewMeadows/fix-mouselook

Fix mouselook roll
Merge branch 'master' of ssh://github.com/highfidelity/hifi into avatar-interaction
Splitting hand collisions between other avatars and ourself.
Moving hand-avatar collision trigger calls into MyAvatar

Also renaming some methods in Model to be more descriptive.
Merge branch 'avatar-interaction' of ssh://github.com/AndrewMeadows/hifi into avatar-interaction