Add signal to add oauth2 created user to humans group.
Add signal to add oauth2 created user to humans group.

aaxelb/SHARE,zamattiac/SHARE,aaxelb/SHARE,aaxelb/SHARE,laurenbarker/SHARE,CenterForOpenScience/SHARE,CenterForOpenScience/SHARE,CenterForOpenScience/SHARE,zamattiac/SHARE,zamattiac/SHARE,laurenbarker/SHARE,laurenbarker/SHARE