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.
make VoxelSystem::deleteVoxelAt() work properly
Adding/removing voxels at different sizes.
Merge branch 'master' of https://github.com/worklist/hifi

Conflicts:
	interface/src/main.cpp
code review fixes
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
removed print statements
Merge remote-tracking branch 'upstream/master'
fixed menu behavior
Added a stub for a Qt application class that creates a menu (which, since it's
unparented, will only appear on OS X) with a test item connected to a slot.
fixed menu behavior