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Summary: Modernize our null annotations From the swift blog: This feature was first released in Xcode 6.3 with the keywords nullable and nonnull. Due to potential conflicts with third-party libraries, we’ve changed them in Xcode 7 to the _Nullable and _Nonnull you see here. drop-conflicts Reviewed By: cuva Differential Revision: D33121042 fbshipit-source-id: 821f5ec858d9afd5bfb1d6081c669f4ca18a36ed