provision 6.x-1.5

Changes since 6.x-1.4:

• Add some same core version migrations.
• Add a migrate test, and cleanup.
• refactor the email setting code so that we have a proper default and we discard a temporary variable
• 1128844 do not prompt-loop over email if -y
• Add the beginnings of some tests.
• #1283926 by bgm: Fixed Small improvement on the trigger/views filtering in the database dump.
• #1278720 by halcyonCorsair: Fixed missing base_url() in install_send_welcome_mail() for drupal 7.
• #1111572 by helmo, Steven Jones: Fixed Undefined index: profiles deploy.provision.inc:84.
• #1150274 by Steven Jones: Fixed Undefined index: user db.drush.inc:288.
• #983056 by Steven Jones: Fixed installer does not properly escape the mysql root password.
• #1263544 by GuyPaddock, Steven Jones: Fixed 'Can only throw objects in provision.config.inc, line 75'.
• #1261006 - Follow up: Tidy docs and add missing parent method.
• #1266484 - Cannot verify Drupal 7.8 with PHP 5.2