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I noticed that if you perform requests asynchronously, but you release the delegate before completion (e.g. close the view controller that's asynchronously loading the name of the logged-in twitter user), you'll get a crash when the nonexistent delegate is messaged.
SHA: 973a8ff makes MPOAuthAPI return the request loaders, and adds a -cancel method to MPOAuthAPIRequestLoader so that it's possible to cancel requests.
Apologies for the other changes in this pull request, which you've already looked at - I can't seem to exclude them from the pull request.