Issue #2136689 by sinn, Steven Jones: Fix display of empty queue message
Issue #2449471 by whitelikeman: Respect other modules if they want to prevent email sending
Issue #2449471 by Steven Jones: Test for Respect other modules if they want to prevent email sending
Issue #2447625 by amontero: Add configurable 'skip on cron' option to hook_cron_queue_info()
Issue #2147329 by alexandrezia: Fixed small typo in drush example value.
Issue #2029373 by Steven Jones: Follow up to Added Configure the amount of time processing the queue.
Issue #2041257 by Steven Jones: Change implementation to use a new mailsystem.
Remove D7 update hook.
Issue #2039741 by Steven Jones: Port the admin UI.
Fix the code so the tests pass.
Begin the port to D8, get tests working.
Issue #2029373 by Steven Jones: Added Configure the amount of time processing the queue.
Issue #1072232 by mcurry, Steven Jones: Added queue_mail_key() config item limited to 128 characters; should be longer, or a textarea for easier editing.
Minor code style cleanups.
Issue #1623344 by Steven Jones: Complete the tests.
Some minor cleanups.
Minor string cleanup.
Small UI string change.
Issue #1606414 by Steven Jones: Added Queue Mail Status.
Issue #1619904 by Steven Jones: Added additional help for choosing mail keys to queue.
Issue #1596200 by Steven Jones: Fixed Add API documentation.
Issue #1618256 by Steven Jones: Added a drush command to drain the mail_queue() without all of cron.
Issue #1605302 by Steven Jones: 7.14 compatibility?.
Issue #1596176 by Steven Jones: Added some tests.
Enforce at least Drupal 7.12, which is our requirement.
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