* Fix; t is now possible to correctly move a TaskBar without getting in to an
  infinite loop which was freezing the browser.
* The timing resolution of jQueryGantt is now 1 hour.
* Fix; GanttMaster.task_ids were not properly cleaned in GanttMaster.reset(),
  resulting wrong links to be created.
* Added a new zoom level where it is possible to see the every 1 hour of 1 day.
* Colorized the Sunday column in suitable zoom levels. In upcoming
  releases it will use the stalker.models.studio.Studio.working_hours attribute
  to determine if the day/hour is an off day/hour.