Update to bootstrap 3.0.0

Hey Ronan,

I noticed the entry in your composer.json file for blocking twitter/bootstrap on version 2.3 wasn't working... When I installed this afternoon components/bootstrap installed version 3.0.0... bummer. So I modified the navbar so it's usable again with bootstrap 3.0.0 :)

Also I changed the link for downloading the phpunit phar because it was 404'ing.

Cheers,

Lisje