Android: TouchImageView
Created by: Mike Ortiz
Updated by: Patrick Lackemacher
Updated by: Anthony Arobone

Date: 2/17/2012
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Adds panning and pinch zoom to Android ImageView.

Update:
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Can now be added to XML layout.
Added support for setting bitmap to null without throwing exception.

Update: Anthony Arobone
Date: 11/12/2013
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Changed default max scale to 4.
Added TAG string for logging.
Added double tap zoom increment to zoom in and back out.
Refactored single click pass-through to super ImageView.