Energy

This moves the HTML files that we are sending to the browser into their own files - this makes them much easier to maintain instead of the weird double quoting I had before...
It also adds the energy display that I mentioned. And a silly favicon (I got tired of all the warnings).
I added the JS library that I use for the graph plotting - it's under MIT license so this shouldn't be a problem, but feel free to skip that commit and instead explain to people how to get this file from http://www.flotcharts.org/