Alert view support for iOS [redacted]

Hey Karl,

After a few weeks of procrastination, it's finally here: support for tapping alert views in iOS whose version shalt not be named.

As usual, patches are WTF public license, just have an extra requirement this time: mention the patch was made by myself, on behalf of OpenTable (we're trying to get our name out in the iOS community :) )

Anyway, let me know if anything's wrong with the patch.