Removes tag lock from podspec and updates CHANGES.markdown for next release
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Add -alertController helper to UIViewController

Typed convenience accessor to -presentedViewController when the type is
a UIAlertController
Opens up -handler on UIAlertAction

[#81152218]
-dismissByTappingCancelButton for UIAlertController

[#81152218]
Adds -dismissByTappingButtonWithTitle: to UIAlertController

* raise exception if button with title does not exist

[#81152218]
Blow up when dismissing cancel button that doesn't exist for UIAlertStyleActionSheet

[#81152218]