drush 7.x-4.0

Release notes

So much new stuff. We have to blog about it. Help people! For now, the latest changes:

Changes since DRUPAL-7--4-0-RC10:

• #1016788 by greg.1.anderson: Sort commands into categories in 'drush help'
• Add 'status' to the list of contextual commands in drush core-cli
• Drush api docs update: remove the -- in options in the help alter hook.
• Document meta::title and meta::summary help items
• Fix minor bug in 'drush help --filter' that stripped the category key from the command categories array
• Add comments on the drush_backend_get_result() API