user can only OWN uniquely named fridges, but they can be members of other fridges with the same name
Merge branch 'master' into user-cant-have-2-same-named-fridges
add correct order of scoping for creator_id and fridge name, soerror message is more precise
Merge pull request #14 from gopher-snakes-2013/user-cant-have-2-same-named-fridges

User cant have 2 same named fridges