Enable complex bundle namespace to load routes

When we have a prefix before the shortnamespace eg MyCompagny\Backend\UserBundle we can't load the routes
Parsing the *Bundle.php file we find now the good namespace to load
Enable to load namespace_prefix with \
Fix route for scopes
Remove var_dump
Fix RoutingLoaderTest
Merge pull request #510 from cedriclombardot/fix-routing-loader

Enable complex bundle namespace to load routes