Add David to AUTHORS. Closes #443.
Add David to AUTHORS. Closes #443.

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