Updated PatientZipper to make methods less complex
Added a test for zip_artifacts
Bumped up code coverage number (a little) and bumped down max_violations
Reduced complexity of ValuesetUpdater#perform
Made some cleanups to valueset_updater_test
Merge pull request #101 from okeefm/patient_zipper_decomplexify

Patient zipper decomplexify
Merge pull request #102 from okeefm/valueset_updater_decomplexify

Valueset updater decomplexify