Feature: Add Silex WebProfiler to Bolt

This small re-write changes the original built-in debugging toolbar with the Symfony/Silex WebProfiler. There was nothing much wrong with the built-in toolbar but the WebProfiler does offer a much better interface in my opinion for debugging routes and requests/responses. Also included is a Doctrine DBAL profiler thanks to the work done by Anton Medvedev <anton@elfet.ru> and Christophe Coevoet <stof@notk.org> who's code I've modified into this re-write.