Added two additional delegate methods that are called when the Next and Previous buttons are tapped in the input accessory view. #58
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I added the delegate methods form:shouldMoveToNextField:fromCurrentField: and form:shouldMoveToPreviousField:fromCurrentField:
They are called when the Next and Previous buttons are tapped in the input accessory view.
The methods can be handy if you have a need to react in some way to the buttons being tapped, and they also allow you to override the default behavior of selecting the next first responder if you have a reason to do so.