jQuery widget upgrade and 

I needed the plugin to work on IE6 so I first included excanvas polyfill to achieve this but anyway I needed to change the plugin. There were also some things in design/flexibility that I think they limit the potential of the plugin, for example to loose coupling the canvas polygon drawing with a textarea, or to always use a reset button no matter if I want it or not. So I needed to change some of those things and ended up upgrading the plugin to also work with the jquery widget pattern, so it seems that lots of things changed but they really not. Lots of pieces of code you first developed were respected and just changed references or stuff like that to make it fit the jquery widget design pattern. Also I updated the readme file for the new flexible way to call the plugin and its methods or callbacks, and also updated the minified script, and added the excanvas script for the demo to work.