Issue with multiple array mappers with same key/attribute name

[mungler]

The logic for looking up an array mapper seems to have a problem if you have multiple array mappers which act on the same key/attribute name (though in different classes).

I think this needs a class reference check also?

https://github.com/dchohfi/KeyValueObjectMapping/blob/master/KeyValueObjectMapping/DCParserConfiguration.m#L103-L114