drupal_queue 6.x-1.3

Changes since 6.x-1.2:

• #1833890 by Deciphered gnindl, pwolanin: fix for data field should be blob not text (backport from Drupal 7).
• #1276598 by msonnabaum, joshuajabbour: fix for Don't set max_execution_time to a lower value than server setting.
• #1256892 by Ben Coleman Fix quoting of SQL queries for PostgreSQL compability.
• #879076 by alex_b, pillarsdotnet, ceardach: Fixed do not set expired=0 where expired is already 0 (performance).
• Fixed drupal_queue_on_cron variable not removed on uninstall.
• #1141338: Cleaned up the README file.