Remove RACExtensions from test targets
Add RACExtensions to product targets
Make RACExtension headers public
mv RACExtensions/* ReactiveCocoaFramework/ReactiveCocoa

Also, in Xcode project land:

    mv RACExtensions/* "Foundation Support"
    rm RACExtensions
Sort Foundation Support group
Add ex-RACExtensions to ReactiveCocoa.h
Header Shit Work
Merge pull request #817 from ReactiveCocoa/graduate-racextensions

Graduate RACExtensions