Add iOS-CODE_SIGN_IDENTITY for OSX-build-scheme as well, due to xcodebuild failure when linked by depending framework (e.g. SwiftTask) and building as sdk=iphoneos but SwiftState-OSX is sometimes associated by xcworkspace.
Merge pull request #12 from ReactKit/code-sign

Add iOS-CODE_SIGN_IDENTITY for OSX-build-scheme as well.