Awesome timeline.

Moved some properties of nav in .main-nav, so that other nav
elements can be created reusing some properties.
A lot of css and js to make the timeline work.
New color variable: @cloud (for the kind-of-white).
New .scroll-to class on .btn button-links (automatic smooth
scrolling).
Import a new FlatUI js file for the radio button.
Refactored the coffee file: better organization, a lot of
refactoring.
Add some paragraphs in the first frame
Nouvelle partie debats.
Introduction text
Add local Lato font for development (need to be checked git status)
Add some test actors.
JS script to automatically order actors in categories.
Switch between position and category view
Actors now move around
Show details of an actor when mouse is over
Bugfix: actors labels inverted
Actors column titles fixed to top when scrolling
Automatic actors labels
Actors filtering
Bugfix: nav badly hides when scrolling