properly handle FSTs that have translations and rotations
support for models in root element
add support for backward compatibility in old versions of models.svo
properly discard piggy back packets that don't match expected version
properly bail on version mismatch
Merge pull request #2889 from ZappoMan/bugfix

Couple of Model Bug Fixes
Merge branch 'master' of https://github.com/highfidelity/hifi into animenu