Add the option for a zoom handler callback
Rename drawHandler to onDraw. Also make it a notification style callback
(does not override the draw functionality).
Add an overlay option 'useTransform' that will transform the overlay
element instead of moving it's postion - useful for SVG elements
Merge branch 'master' into custom_zoom_handler
fix: remove the useTransform/SVG stuff and move back to a simple onDraw callback only so people can handle their own custom drawing and sizing
Use the correct onDraw in drawer.js. Remove imageFullSize and fix up the comment for onDraw
Merge pull request #160 from lukemurray/custom_zoom_handler

Add the option for a zoom handler callback