refactor(boostrap): custom variables + components
style(navbar): color + spacing + links
style(home): first responsive version

 * form
 * grid layout
 * top navbar
fix(home): menu collapse & 2 col innovation
style(home): responsive header image + thumbnails
Merge branch 'dev' into boostrap-custom

Conflicts:
	app/templates/index.html
Merge pull request #14 from spiroid/boostrap-custom

Boostrap 3 intégration + responsive design