Pytest support

[crcrewso]

Adds support for pytest, allowing for parallel running of unit tests without breaking unittest compatibility.
For context see issue #349

Due to current test indexing structure, using pytest can only be run after first run of unittest. This is unavoidable

[coveralls]

Coverage increased (+0.02%) to 80.915% when pulling 94d92e3 on crcrewso:pytestSupport into 01c81af on jrkerns:master.

[jrkerns]

Could you make a new file requirements-dev.txt and copy the current requirements file and put the pytest dependency there. Normal users shouldn't need the pytest module, but will be needed on the dev end.

[crcrewso]

Could you make a new file requirements-dev.txt and copy the current requirements file and put the pytest dependency there. Normal users shouldn't need the pytest module, but will be needed on the dev end.

Done, and I've squashed the commits

[jrkerns]

👍