Add support for the graph in non-WebGL capable browsers

[cloudtracer]

Might be more effort then its worth, but worth tracking for the time being. The current graph requires the use of WebGL and the canvas and this isn't universally supported yet. The problem with not using WebGL is that the graph usually grows too big for non-webgl based graphs fairly quickly.

In 3.0.6 we disabled the graph for non-webgl capable browsers.