Update dataset metadata when categories are edited/delete in admin. Closes #352.
Update dataset metadata when categories are edited/delete in admin. Closes #352.

datadesk/panda,pandaproject/panda,ibrahimcesar/panda,PalmBeachPost/panda,newsapps/panda,datadesk/panda,NUKnightLab/panda,PalmBeachPost/panda,pandaproject/panda,newsapps/panda,pandaproject/panda,pandaproject/panda,PalmBeachPost/panda,ibrahimcesar/panda,newsapps/panda,datadesk/panda,ibrahimcesar/panda,datadesk/panda,PalmBeachPost/panda,datadesk/panda,ibrahimcesar/panda,newsapps/panda,NUKnightLab/panda,PalmBeachPost/panda,ibrahimcesar/panda,NUKnightLab/panda,pandaproject/panda,NUKnightLab/panda