Added statuses_for_stuff_to_do plugin setting.
Added statuses_for_stuff_to_do filter to listed issues in stuff to do page.
Added status to issue partial on stuff to do page.
Add default of 'all' to list all open statuses (equivalent to current behavior without this new setting).
Remove issues from stuff to do when issues are updated with unavailable status.
Merge remote-tracking branch 'jangosteve/add-status-config'