Add CollectionRoles and CollectionPrefs docs
Add CollectionRoles and CollectionPrefs docs

Closes #329

marten/Panoptes,srallen/Panoptes,srallen/Panoptes,astopy/Panoptes,rogerhutchings/Panoptes,parrish/Panoptes,camallen/Panoptes,camallen/Panoptes,parrish/Panoptes,marten/Panoptes,srallen/Panoptes,astopy/Panoptes,marten/Panoptes,marten/Panoptes,rogerhutchings/Panoptes,rogerhutchings/Panoptes,astopy/Panoptes,edpaget/Panoptes,camallen/Panoptes,rogerhutchings/Panoptes,zooniverse/Panoptes,astopy/Panoptes,edpaget/Panoptes,edpaget/Panoptes,zooniverse/Panoptes,srallen/Panoptes,zooniverse/Panoptes,camallen/Panoptes,parrish/Panoptes,zooniverse/Panoptes,edpaget/Panoptes,parrish/Panoptes