Added optional support for iOS 6's StoreKit to allow rating without leaving the app.
Added config option for disabling animation (used in StoreKit views) and delegate methods for showing/hiding the modal StoreKit view.
Added API method to close open modals.
Merge pull request #91 from nathangreenstein/master

Added support for iOS 6's StoreKit
Improved Readme's StoreKit info.
Fixes critical bug where StoreKit view wasn't shown when triggered from a UIAlertView.
Left some testing code in. Don't mind me.
Merge pull request #92 from nathangreenstein/master

Fixed critical StoreKit bug, updated readme