Begin work on canvas renderer module in case no Raphael.
Change rendering to construction of abstract scene graph.
Fix bug with object initialization.
Merge branch 'ft-export' into develop

Conflicts:
	polychart2.js
	polychart2.min.js
	polychart2.standalone.js
	src/render.coffee

Much reliance on Raphael is alleviated. In the case that Raphael is not found,
a sort of abstract scene graph is constructed in lieu of the SVG scene.
Rename canvas -> paper.
Remove dependence on Raphael in scale.coffee.