Add hotkey Shift+CMD+Q in editor for quit to project manager, resolves
issue #406
Add 'mesh/skeleton' property to MeshInstance to decouple mesh->skeleton from child parent constraint
Auto generate editor_icons.cpp to make it more easy to update editor icons
Add sCons dependency for editor_icons.cpp, so it's only re-generated when there're icon changes
A bit of everything:

-IMA-ADPCM support for samples, this means that sound effects can be compressed and use 4 timess less RAM.
-New 3D import workflow based on Wavefront OBJ. Import single objects as mesh resources instead of full scenes. Many people prefers to work this way. Just like the rest of the imported resources, these are updated in realtime if modified externally.
-Mesh resources now support naming surfaces. This helps reimporting to identify which user-created materials must be kept.
-Several fixes and improvements to SurfaceTool.
-Anti Aliasing added to WorldEnvironment effects (using FXAA)
-2D Physics bodies (RigidBody, KinematicBody, etc), Raycasts, Tilemap, etc support collision layers. This makes easy to group which objects collide against which.
-2D Trigger shapes can now also trigger collision reporting in other 2D bodies (it used to be in Area2D before)
-Viewport render target textures can now be filtered.
-Few fixes in GDscript make it easier to work with static functions and class members.
-Several and many bugfixes.
Fix potential null exception in screen button without texture assigned
Fix script editor scrollbar disappear issue
Merge pull request #434 from marynate/PR-fix-script-editor-scroll

Fix script editor scrollbar disappear issue
Merge pull request #432 from marynate/PR-fix-screen-button-null-texture

Fix potential null exception in screen button without texture assigned
Merge pull request #415 from marynate/PR-auto-editor-icons-cpp

Auto generate editor_icons.cpp to make it easy to update editor icons
Merge pull request #413 from marynate/PR-decouple-skeleton-mesh

Add 'mesh/skeleton' property to MeshInstance
Merge pull request #410 from marynate/PR-hotkey-quit-to-pm

Resolve issue #406 by adding hotkey for "quit to project manager"
Add pan mode in 2d editor
Add 2d unifrom scale
Merge pull request #368 from marynate/PR-2d-editor-ux

Add pan mode to 2d editor
Merge pull request #436 from marynate/PR-2d-uniform-scale

Add 2d unifrom scale
Merge remote-tracking branch 'upstream/master'