Add Bootstrap::2.3.1 as theme 'bootstrap'
Merge branch 'develop' into theme/bootstrap
Merge branch 'develop' into feature/core
Move folder themes from fuel/app/ to fuel/
Add a base and authenticated controller

Also add 404 routing to 'base/404' with a dedicated template and view
Fix bug in Gasoline\Message not using \Event
Add routes for _404_ => 'base/404'
Update bootstrap themes to add some stats to the footer
Add two controller templates Controller\{Base,Authenticated}
Update Controller\Welcome to use Controller\Base