TST: Don't pass DataFrame to numpy
TST: Dont set_index with PeriodIndex. Known bug.
TST: Not a failure if joblib is installed
TST: Use NumpyVersion
TST: Don't use generator. Closes #1145.
TST: knownfailureif -> skipif
Merge pull request #1549 from jseabold/test-fails

TST: Fix locally failing tests.