Use glDrawRangeElements, which indicates the range of used indices.  It may or
may not make a difference in performance, but it won't hurt.
Merge branch 'master' of https://github.com/worklist/hifi
Added basic capsule/sphere collisions between avatar and voxels.
Only do collision checking for own avatar.
Compute nodes' enclosing radius in the same place.
Merge pull request #366 from ey6es/master

Added basic capsule/sphere collisions between avatar and voxels; added casted getter for Application instance; switched to glDrawRangeElements for voxel rendering.