Enable tests and coverage

[jcbf]

Fix for #17

[coveralls]

Coverage increased (+5.1%) to 30.932% when pulling 2ed2cfe on enable_tests into 9efdfd0 on master.

[coveralls]

Coverage increased (+11.9%) to 37.712% when pulling f05376f on enable_tests into 9efdfd0 on master.

[coveralls]

Coverage increased (+47.7%) to 73.517% when pulling b629a33 on enable_tests into 9efdfd0 on master.

[coveralls]

Coverage increased (+49.2%) to 75.0% when pulling 5f434ce on enable_tests into 9efdfd0 on master.

[coveralls]

Coverage increased (+54.08%) to 79.873% when pulling 20e3366 on enable_tests into 9efdfd0 on master.

[coveralls]

Coverage increased (+54.8%) to 80.603% when pulling 7402f17 on enable_tests into 9efdfd0 on master.

[coveralls]

Coverage increased (+53.09%) to 78.879% when pulling 3b68ea4 on enable_tests into 9efdfd0 on master.

[coveralls]

Coverage increased (+53.5%) to 79.31% when pulling ed5ba08 on enable_tests into 9efdfd0 on master.