We can mark a task as done (and undone)
Removed slider and info about %done from the UI
Removed references to tags from the UI
Disabled task drag&drop for tasks

 * only used to handle unsupported tasks
   * move a task as a child of someother task
   * move a task to a different tasklist
Merge pull request #5 from Zentyal/mjulian/task-completeness

Mjulian/task completeness