Add is_volunteer property
Add is_volunteer property

This should have been added in 67253a0.

pathunstrom/pygotham,pathunstrom/pygotham,pathunstrom/pygotham,djds23/pygotham-1,pathunstrom/pygotham,djds23/pygotham-1,djds23/pygotham-1,PyGotham/pygotham,PyGotham/pygotham,djds23/pygotham-1,PyGotham/pygotham,pathunstrom/pygotham,PyGotham/pygotham,PyGotham/pygotham,djds23/pygotham-1