bug 839696 - visualize crontabber state

This is the first version of the crontabber state "visualization".
It just lists the apps and their info in nest bullet point list. Their indentation is meant to describe dependency. 

The next step is to add some sexy directed graph that can be the main way to display this information.

It currently looks like this: http://cl.ly/Mup9
(I made that by hijacking the JSON output from the middleware by messing with the JSON file cache)

NB: this code was written in a bit of a rush and the CSS could do with a make-over too if time allows.