Introduce Jinja base template

* Tweak some whitespace in base template partials
* Introduce Jinja base template for the fans of [Jinja template engine](http://jinja.pocoo.org/)
* Fix the whitespace in MoJ ASCII art

Before
![before](https://cloud.githubusercontent.com/assets/203886/4422910/6d15286c-4590-11e4-945a-464e0c88c77e.png)

After
![after](https://cloud.githubusercontent.com/assets/203886/4422912/70ab8002-4590-11e4-91d3-1ac55d1999d7.png)