HHVM does not support Imagick::clone

Always use the clone keyword
http://docs.hhvm.com/manual/en/imagick.clone.php
Merge branch 'RdeWilde-patch-1'

* RdeWilde-patch-1:
  HHVM does not support Imagick::clone
Merge branch 'master' into develop

* master:
  HHVM does not support Imagick::clone