Use downloadProgress rather than isFinished (which worked on files, but didn't
on HTTP URLs).
Merge branch 'master' of https://github.com/worklist/hifi
Merge branch 'master' of https://github.com/worklist/hifi
Merge pull request #487 from ey6es/master

Fix for loading avatar voxels from the web.
Merge branch 'master' of https://github.com/worklist/hifi into voxel_animation