update anchors when selection applied.
Physics Joints handles movable.
update UUD’s of copy/paste.
Merge branch 'develop' of https://github.com/apportable/SpriteBuilder into develop
visible and locked joints.
File view background color is light grey again.
Warnings view: Cells with gradient selection now.
File view cells: Text vertical position fixed for normal and in editing drawing.
Warning icon now aligns with the right hand bounds of the cell.
Merge branch 'develop' of https://github.com/apportable/SpriteBuilder into develop

Conflicts:
	SpriteBuilder/SpriteBuilder.xcodeproj/project.pbxproj
remove binary file attribute on project.
Merge pull request #340 from jtwigg/develop

Develop
SizeType set fix
Merge pull request #338 from NickyWeber/feature/#318_cleaning_warnings_take2

Feature/#318 cleaning warnings take2
update SB+SK module
fix button background opacity sometimes not applied
timeline: hide easing modes not in Sprite Kit
SB+SK updated
added SK file node, fix ccb dragging creating CCFile node
pbxproj update with new SKFile node plugin
sb+sk submodule update