New Aggregate target creates a cocos2d.framework  containing cocos2d 2.1

caveats:
1.  only bundles kazmath as that is all I need at the moment
2.  still have to add libz.dylib in project using this
3.  cocos2d project now builds all active architectures so that they can be bundled in the resulting .framework
4.  modeled framework build process after how sparrow does it.  good read here:  https://github.com/jverkoey/iOS-Framework
5.  the created cocos2d.framework includes  bundles armv7, armv7s, i386 binarys
6.  had to rename cc2d static library product name to match framework script expectations.
7.  kazmath bundling is hardcoded in the build phase since we don't have a true framework target in xcode (for iOS)