Fixed issue with mouse pressed state, use mouse buttons to add/delete voxels
(numbers now switch between modes).
Working on adding an "add voxel in front of avatar" command.
Show the voxels to be added/deleted as wireframe cubes.
Starting on coloring support.
Adding/removing voxels at different sizes.
Merge branch 'master' of https://github.com/worklist/hifi

Conflicts:
	interface/src/main.cpp
Merge pull request #271 from ZappoMan/master

Fix VoxelSystem::deleteVoxelAt() to correctly update rendered scene
Merge branch 'master' of https://github.com/worklist/hifi
Use isColored, not getShouldRender.
Merge pull request #272 from ey6es/master

Improvements to voxel editing: show what you'll be adding/removing/coloring, allow adjusting the desired size.
Re-added Head Mouse working correctly with invensense
Merge remote-tracking branch 'upstream/master'
Merge pull request #273 from PhilipRosedale/master

Re-Added Head Mouse for Invensense
fixed menu behavior