agraph.js is generated by running this

coffee --watch --compile --output html/js/ .

Here is how I make the browser auto reload when there are changes

inotifywait --monitor --recursive --event modify html/ |
    while read crap
    do echo $crap
        xdotool search --name 'agraph - chromium' key ctrl+r
    done

There is a development server too

python -m SimpleHTTPServer