Version bump to 0.4.0
Version bump to 0.4.0

joeybaker/activerecord-postgres-hstore,softa/activerecord-postgres-hstore,softa/activerecord-postgres-hstore,diogob/activerecord-postgres-hstore,joeybaker/activerecord-postgres-hstore,darrencauthon/activerecord-postgres-hstore