DrupalNodeRevision => Revision model renam

[jywarren]

Last of the first batch of legacy renamings in #956

• all tests pass -- rake test:all
• code is in uniquely-named feature branch, and has been rebased on top of latest master (especially if you've been asked to make additional changes)
• pull request is descriptively named with #number reference back to original issue

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[jywarren]

:-)