Started on ambient occlusion shader.
Merge branch 'master' of https://github.com/worklist/hifi into ssao
Started on C++ side of SSAO effect.
Added VoxelImporter class
add new Menu class for Application cleanup
Merge branch 'master' of https://github.com/worklist/hifi into separate_import_with_preview
signed UNKNOWN_NODE_ID should be 0
suppress warnings for glm headers that pop up in Xcode 5
Merge branch 'master' of https://github.com/worklist/hifi into ssao

Conflicts:
	interface/src/Application.h
Missed a spot in the merge.
starting to add PACKET_TYPE_VOXEL_JURISDICTION
initial decoupling of menu from Application
change signature of Menu helper for cleaner code in ctor
inlined spacing cleanup in Head, remove noise
update Q_OS_MAC ifdefs for Qt 5
fix hook to Webcam toggle from Menu
fix hooks for skeleton tracking and collisions
fix hooks for webcam mode cycle and texture
move Avatar goHome to Avatar slot
Merge remote-tracking branch 'upstream/master' into menu