Theme generator.

Work in progress, will probably end up in tools or something like that.
Problem is that less.js APi is not documented so I have to digg in the source.
It also requires less 2.0.

Allow you to easy generate a theme for the notebook. It should even be able to watch for file change and recompile on the fly.

With 
```
i= setInterval( 
  function(){
    $('head>link:nth(4)').attr('href',"/static/style/style.min.css?v="+Date()); console.log(Date())}
  , 4000)
```
it allows the css to be live reloaded in the notebook, without refreshing the page, which is nice to play with css.. 
cause it's in progress, and I'm using it to sync in between machines :-P