Development release.
Fixes a performance issue with javascript. #1184722: Drupal.behaviors.rubik have a great performance leak
Changes since 6.x-2.0-alpha2:
N.B. Skipping 6.x-2.0-alpha3, to keep synchronized with provision_tasks_extra.
Changes since 6.x-2.0-alpha3:
Added option for generating order hash in payment form