Added a method to configure a UITableViewController with an iOS 6 control

The idea is you can use this to set up a UIRefreshControl if it's available, and if it isn't fall-back to the ODRefreshControl. This allows you to use the new control for iOS 6, but still support users on iOS 5. This will also allow you to use this control for a scroll view or table view not in a UITableViewController too, so there's added benefit even if you're only targeting iOS 6.