removed VoxelSystem::createSphere() which was dead code
removed addRandomSphere() which was dead code
update TREE_SCALE to 128 so it's power of 2, and MAX_VOXELS_PER_SYSTEM to 500k
dead code cleanup
Tweaks to createSphere() plus some new helper functions
- changed createSphere() to support new NATURAL mode which uses perlin
  noise to create natural color and shape
- added getVoxelCount()
- coding standard cleanup
added SceneUtils.h/.cpp which moves addSphereScene() to a common location
dead code cleanup
code cleanup, new scene
Fixed a couple bugs in pointToVoxel()
- fixed a byte packing bug related to having exactly 7 bits of octal data
  where we weren't correctly packing the last bit and moving the byte count
  forward. This resulted in bogus colors being written
- fixed a bug for points that exactly match an octet boundary test creating
  voxels that are one a unit smaller than they should be
Merge branch 'master' of https://github.com/worklist/hifi into render_voxels_optimization
cleaned up compiler warning
Added more SceneUtils support cleaned up voxel-edit to use scene utils
- Added addCornersAndAxisLines() scene
- Added addSurfaceScene() scene
- moved improved addSphereScene() from voxel-edit to SceneUtils.cpp
- added command line options to voxel-edit to create different scenes
CR cleanup
removed a redundant comment
moved voxels file to resources directory
moved voxels file to resources directory
Merge pull request #242 from ZappoMan/render_voxels_optimization

Fixed some bugs, and made better scenes