Corrected a problem with button taps not making it through to dismissWithClickedButtonIndex.

Should eventually make this a proxy/wrapper for a UIAlertView rather than extending it.

Taken from https://github.com/wordpress-mobile/WordPress-iOS/commit/6a2c56de63f0bc4422e35c6a4c758b707abd9442
Don't extend UIAlertView - but rather encapsulate it.
Merge pull request #8 from astralbodies/master

Corrected a problem with button taps not making it through to dismissWit...