Add logic to account for dissertation/thesis
In the case of a dissertation or a thesis, the department was showing up as a
contributor (dc.contributor.department), as were the advisors/committee
members. This is not accurate, so we only take the author (dc.creator) for
dissertations and theses, where we continue to take all contributors for other
types of content.
Remove some print statements
Merge pull request #10 from csheldonhess/master

Deal with dissertations/theses