Fix failing Travis tests #72
Description
Some of the Travis tests have been failing with complaints about how we're using test fixtures: https://travis-ci.org/UDST/developer/jobs/622767650
I'm guessing there was an update to PyTest and it's now stricter than it used to be. If this is what's happening, we can either fix our test scripts to conform to the new standards (ideal) or pin PyTest to an earlier version.