Update to three.js r64
Update getPositionFromMatrix calls to setFromMatrixPosition to match latest revision

Copied from https://github.com/virtual-world-framework/three.js.git
Revision 46afb9d4f8499d78c7996f6427420221e4b60556
Merge pull request #93 from virtual-world-framework/threejs-64

Update to three.js r64