Adding support for UIScreenEdgePanGestureRecognizer via existing on_pan helper #211
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I needed to use a pan gesture recognizer that only recognizes gestures from the edges.
I thought it would be simples from an API perspective to add an :edges option to the existing on_pan method from gestures.
If the edges option is present, and is anything other than [:none], we use the UIScreenEdgePanGestureRecognizer instead of the UIPanGestureRecognizer.
It is not valid to specify fingers options or count for the edge recognizer in IOS so I ignore any of those options if specified along with :edges.