github/ReactiveCocoa — pull request #56 by joshaber (2012-09-17 14:20:49+00:00)
Title: Moved +command from RACAyncCommand to RACCommand

It was just in `RACAsyncCommand` because it didn't seem to make any sense to create a command without an execute block. But now we've come around to the idea that a command could just be a signal, in which case it certainly makes sense to have a command without an execution block.