initial broken cell locking.
Merge branch 'develop' of https://github.com/jtwigg/SpriteBuilder into locked_cell

Conflicts:
	SpriteBuilder/SpriteBuilder.xcodeproj/project.pbxproj
	SpriteBuilder/ccBuilder/en.lproj/MainMenu.xib
Fix memory leaks and optimize memory usage.
Fix readonly InspectorFloatCheck’s
working locked joints and SequencerJoint.
don’t render SequencerJoints on stage.
locking down joints when appropriate.
update cocos2d version.
adding kinetics to SB
Merge branch 'develop' of https://github.com/apportable/SpriteBuilder into kinetics

Conflicts:
	SpriteBuilder/libs/cocos2d-iphone
kinetic body serialization.
Merge branch 'develop' of https://github.com/apportable/SpriteBuilder into develop

Conflicts:
	SpriteBuilder/libs/cocos2d-iphone
Merge branch 'develop' of https://github.com/jtwigg/SpriteBuilder into kinetics

Conflicts:
	SpriteBuilder/libs/SpriteKit
upgrade cocos2d iphone.
Merge branch 'develop' of https://github.com/apportable/SpriteBuilder into develop

Conflicts:
	SpriteBuilder/libs/SpriteKit
fixed to physics
update cocos2d version.
Merge pull request #369 from jtwigg/develop

Develop
Merge branch 'develop' of github.com:apportable/SpriteBuilder into develop-steffen

Conflicts:
	SpriteBuilder/libs/SpriteKit
sk default project assert when scene is nil