Click to show source code for feature demo

This implements @cjh1's idea about displaying source code for the generated features.

http://opengeoscience.github.io/geojs/examples/features.html
I think it should be possible to bind handlers just like you do in d3. It will be some work but we have to do it regardless to make it easy for others. Yes, I am planning on events like mouseover. I think, we will have select for selection and pick for picking?