add tool_task_description to subjects serializer
add tool_task_description to subjects serializer

HackTheDinos/crowd_saurus,HackTheDinos/crowd_saurus,zooniverse/scribeAPI,UCDavisLibrary/scribeAPI,HackTheDinos/crowd_saurus,zooniverse/scribeAPI,YaleDHLab/ensemble-at-yale,HackTheDinos/crowd_saurus,YaleDHLab/ensemble-at-yale,UCDavisLibrary/scribeAPI,HackTheDinos/crowd_saurus,zooniverse/scribeAPI,UCDavisLibrary/scribeAPI,UCDavisLibrary/scribeAPI,YaleDHLab/ensemble-at-yale,zooniverse/scribeAPI,YaleDHLab/ensemble-at-yale,UCDavisLibrary/scribeAPI