Modify tests now that max_age/min_age related fields are integers.
Modify tests now that max_age/min_age related fields are integers.

pattisdr/lookit-api,CenterForOpenScience/lookit-api,CenterForOpenScience/lookit-api,CenterForOpenScience/lookit-api,pattisdr/lookit-api,pattisdr/lookit-api