TouchDraw 1.3.1

New Features
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   * Added the ability to export drawings as Visio documents.
    
Useability Enhancements
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   * Updated the path bounds to not include the handles (iOS 4.2 or newer).
   
Bug Fixes
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   * Fixed an issue with converting the clipboard contents to an image on exit.
   * Fixed an issue when toggling layer visibility while editing the layer names. 
   * Fixed an issue with removing figures from a layer.
   * Minus signs weren't previously allowed in the numeric text fields.
   * Fixed an issue with removing all of the layers leading to the layer stack being corrupted.