Refactored design of user interface: Sphinx form on top...

...diecutter form on bottom, two 'about' sections in sidebar, using bootstrap 3.
Refs #1

Before:

![screenshot](https://cloud.githubusercontent.com/assets/235204/2689946/2cc52bd2-c326-11e3-88cf-649107e5a621.png)

With this pull request:

![screenshot](https://cloud.githubusercontent.com/assets/235204/2689942/f9b23fb4-c325-11e3-868b-d99347b8cb6b.png)