Add Listing associations to User model
Add Listing associations to User model

 - Add Listing association where User is creator of listing
 - Add Listing association where User is follower of listing

femmestem/HARE,erikcaineolson/HARE,femmestem/HARE,HumanAssistanceResourceExchange/SHARE,HumanAssistanceResourceExchange/SHARE,femmestem/HARE,erikcaineolson/HARE,HumanAssistanceResourceExchange/SHARE,erikcaineolson/HARE