PSR-2 clean up of Controllers/Async.php
PSR-2 clean up of Controllers/Backend.php
PSR-2 clean up of Controllers/Cron.php
PSR-2 clean up of Controllers/Extend.php
PSR-2 clean up of Controllers/Frontend.php
PSR-2 clean up of Controllers/Upload.php
Merge pull request #1651 from GawainLynch/psr-2/Controllers

PSR-2 clean up of Bolt/Controllers/