Merge pull request #20 from materialsvirtuallab/master

Add more travis tests, includnig some command line tests.
fix recent bug for when fw_id is explicitly set to 0 by user
Merge pull request #21 from materialsvirtuallab/master

v3.2 for py3 test.
Merge pull request #22 from materialsvirtuallab/master

Cleanup and drop py3.2 support as Jinja2 does not support Jinja2.