Set normals based on indices, cache face models.
Don't render neck/neck base when blend face is active.
Merge branch 'master' of https://github.com/worklist/hifi into blendface
Merge pull request #972 from ey6es/blendface

Cache face models, don't render neck/neck base when face model is displayed.
Merge branch 'master' of github.com:worklist/hifi into assignment