all ARC readiness issues fixed (as far as compilation is concerned)
ARC readiness: leave ThoMo as MRC, remove SCEvent bridge casts
ARC readiness: keep some other libs MRC for now
ARC conversion succeeded (SB unusable in current state)
fixed scene nodes not retained
added WARN macro, warn use of cocosscene singleton when nil
fixed several (unrelated) analyzer warnings
some xib change (plugin version, from xcode)
fixed the blank cocos2d view
converted TabBar, Inspector and other "lib" classes to ARC
Merge branch 'refs/heads/develop' into convert-to-ARC

Conflicts:
	SpriteBuilder/SpriteBuilder.xcodeproj/project.pbxproj
	SpriteBuilder/ccBuilder/UsageManager.m
	SpriteBuilder/ccBuilder/en.lproj/MainMenu.xib

Conflicts:
	SpriteBuilder/ccBuilder/ResourceManagerPreviewView.h
	SpriteBuilder/ccBuilder/ResourceManagerPreviewView.m
	SpriteBuilder/libs/cocos2d-iphone
ignore SPRITEKITPROJECTNAME.zip
SB ARC: fix LabelTTF node not showing the system font list
refactor: replaced appdelegate singleton properties (resource, plugin)

- prevent confusing them as properties/ivars of the appdelegate
- use the singletons the same way throughout app (some code went through appdelegate properties, most used sharedManager singleton accessor as one would expect it to be used)
- removed passing around resource manager to another class (one instance)
SB ARC: fix wrong and superfluous uses of weak/__weak
fix wording on color node descriptions
log cases where node plugin defines an invalid nodeEditorClassName
added SKNode plugin

Conflicts:
	Test/SpriteKitReader-Experimental/SpriteKitReader-Experimental/SKReaderTestData.spritebuilder/Source/Resources/Published-Android/MainScene.ccbi
	Test/SpriteKitReader-Experimental/SpriteKitReader-Experimental/SKReaderTestData.spritebuilder/Source/Resources/Published-iOS/MainScene.ccbi
	Test/SpriteKitReader-Experimental/SpriteKitReader-Experimental/SKReaderTestData.spritebuilder/SpriteBuilder Resources/MainScene.ccb
	Test/SpriteKitReader-Experimental/SpriteKitReader-Experimental/SKReaderTestData.spritebuilder/SpriteBuilder Resources/MainScene.ccb.ppng
SKNode plugin property defaults changed
improved CCNode description string