Om dynamic methods should be able to support reserved words like 'type'

[jcoyne]

Formerly HYDRA-700

obj.descMetadata.subject.type raises the deprecation warning.

We ought to be able to use something like this as a work around:

obj.descMetadata.subject.type_

Here's the way it's currently done.
obj.descMetadata.term_values(:subject, :type) works