Merge pull request #974 from ey6es/blendface

Render blended faces as solid and remove the "Use Faceshift Rig" option (which isn't visible to others).
Increase thrust while holding keys down to allow very fast speeds
remove unused older voxel grab thrust
missing space
Merge pull request #975 from PhilipRosedale/master

Increase thrust while holding keys down to allow very fast speeds
Merge branch 'master' of https://github.com/worklist/hifi into blendface