migrated to cocos2d 3.1; now using submodules; updated xcode project to SDK 7.1 and associated things, minimum deployment 5.1.1
manually merged changes by @richardgroves who updated things for cocos2d 3.0; especially appdelegate, scene management, and CCNode+SFGestureRecognizers; see https://github.com/NoodlFroot/smooth-drawing/commit/3d4435ba134dbad2c66e5abe9817e84264a6e5a9
success with much help from http://forum.cocos2d-swift.org/t/2-x-to-3-1-shader-help/14015 -- @arseybee and @slembcke