added get all the Companion Plant entries that have the specified Plant Id https://app.asana.com/0/201954860780444/205761505868187
added get all the Companion Plant entries that have the specified Plant Id
https://app.asana.com/0/201954860780444/205761505868187

DannyEaton/growify,rdicharry/growify-fork-20161209,DannyEaton/growify,rdicharry/growify-fork-20161209,DannyEaton/growify,rdicharry/growify-fork-20161209