- Added fix for iPad crash when requesting photo access in Message Center.
 - Occurs on iPads when authenticating Photo access via UIImagePickerController in a UIPopoverControl from a UIBarButtonItem.
 - Fix is to center the popover in the center of the Message Center view, rather than pop out from the photo button.
http://stackoverflow.com/questions/18939537/uiimagepickercontroller-crash-only-on-ios-7-ipad
http://openradar.appspot.com/radar?id=6369788687286272
 - Fixes IOS-336