Python Implementation of tests

[palchicz]

Reimplement the tests from #12 and #13 for the python library. You should be able to use the same cucumber spec for both, but will need to write new bindings.

[cjmyers]

pySBOL tracker?

[palchicz]

This is for the industrial consortium sponsored project of getting the SBOLTest Suite to validate multiple libraries

[palchicz]

@cjmyers The idea is to use this repository to validate multiple SBOL client libraries. They should go into a single repo instead of being spread out amongst multiple repositories. Cucumber is a tool that lets one write a test once and execute it multiple times against different, language agnostic implementations. @jakebeal can give more detail.

[cjmyers]

We have an SBOLTestRunner (see Meher's MS thesis) which does something very similar. Anyway, I'm not sure if this should be coupled to this repo or a new application that uses this as a submodule.