ImageSprite Enhancement 2 (Fill Canvas)

This is fix to the ImageSprite component to allow it to fill the Canvas.

This change is documented in my imagesprite proposal under enhancement  2. Below is the link to the document
https://docs.google.com/document/d/1hJGVAOR8cQ788K7vHQe3DWF2j-73SNOnAOacjvaiGVI/edit?usp=sharing