This makes the Queue class autoloadable and fixes cases
were a consumer wants to set a queue driver via a bootstrap
file loaded from the autoload/files section of the composer.json.
The bootstrap file might be loaded before the functions.php and
the queue() function is then not available.

approved these changes Jan 10, 2017

jsor added this to the v3.0 milestone

clue approved these changes Jan 24, 2017