Small tweaks

Changes:

* Autoscroll build output to the bottom for fast access to the test results
* reduce the font size and widen the design to fit more information on the screen
* Add setup notes to README
* Make the HOST parameter configurable to ease local development
* Add a console script

![build output](http://f.cl.ly/items/3f0z161R0r2R06333D3e/Screen%20Shot%202013-08-20%20at%2013.30.55.png)
![Index page](http://f.cl.ly/items/2x1W3e0o460I0T020u38/Screen%20Shot%202013-08-20%20at%2013.30.43.png)