Galaxy zoo port

Looks like this was from the cellects_hosts attribute.  If that got reverted, it never cleared it from the database migrations

``` bash
$ git log -p | grep hstore
+  enable_extension "hstore"
-    enable_extension "hstore"
-    add_column :users, :cellect_hosts, :hstore, default: {}
-  enable_extension "hstore"
-    t.hstore   "cellect_hosts",          default: {}
+    enable_extension "hstore"
+    add_column :users, :cellect_hosts, :hstore, default: {}
+  enable_extension "hstore"
+    t.hstore   "cellect_hosts",          default: {}
```