CocoaPods/Xcodeproj — pull request #13 by irrationalfab (2012-05-27 14:18:07+00:00)
Title: [Config] Add non destructive merge and convenience methods.

From https://github.com/CocoaPods/CocoaPods/blob/master/lib/cocoapods/specification.rb#L211...L240.

I think that in future the `#add_frameworks` and `#add_libraries` might check for duplicates (see CocoaPods/CocoaPods#114)