Rename controllers to fit Symfony guidelines

Signed-off-by: Gawain Lynch <gawain.lynch@gmail.com>
Make BoltBBController a proper controller

Signed-off-by: Gawain Lynch <gawain.lynch@gmail.com>
Make BoltBBAdminController a proper controller

Signed-off-by: Gawain Lynch <gawain.lynch@gmail.com>
Make the extension's container a bit prettier to call 

Signed-off-by: Gawain Lynch <gawain.lynch@gmail.com>