Marking select as a field type that supports multifield
Merge pull request #77 from Schreiber-und-Freunde/master

Fixes an error when display_callback is an array
Merge pull request #73 from rinatkhaziev/master

Marking select as a field type that supports multifield
Adds filters for _field_types_that_are_read_only and _field_types_that_support_multifield