Add support for block-based alertViewShouldEnableFirstOtherButton: delegate method
If a UIAlertView is init'ed without any otherButtonTitles, the alertViewShouldEnableFirstOtherButton: delegate method won't be invoked even if otherButtons are added later via addButtonWithTitle:
Merge pull request #5 from Citrrus/master

Add Support for UIAlertView alertViewShouldEnableFirstOtherButton: delegate method