* Cleaned up various mismatches in method signatures that were preventing documentation generation
* Removed naked ampersands from comments as they cause XML parser failures during docset generation via appledoc
* Factored out display of alerts into RKAlert interface that hides the differences between UIKit and OS X Cocoa.
* Added macosx to supported platforms to enable build on OS X.
* Configured project to use conditional architectures to enable building on OS X and iOS from the same targets.
* Implemented a bare-bones OS X example app.
* Create `rake build` task for building RestKit against iOS and OS X SDK for quick testing.
* Updates YAJL Parser not to raise an exception and crash when it encounters invalid JSON. The other parsers need to be aligned with this behavior and the delegate methods updated. See Pivotal Story: https://www.pivotaltracker.com/story/show/11925617
* Added requestDidCancel: delegate invocation for tracking cancellation of requests.
* Ensure that the request queue timer is cleared during indeterminate deferral of request loads.
