Using bootstrap

Working with the top navigation bar and the blog, it felt that a grid system and some basic widgets may be useful to speed up development.

The proposals site is using bootstrap, so here is the suggestion to introduce bootstrap.

Benefits:
- Responsive grid system: better than adding responsibe behavior for every widget in every page (quite a lot of work).
- Basic widgets like navigation, buttons, pagination, ...

Note: colors fonts and stuff can be overridden easily when using bootstrap-sass.

I'm working in a branch with bootstrap and the navigation bar behaves much better.

Therefore I leave here the question: do you want bootstrap? I do :)