pytest.ini's relationship to py.saunter framework needs to be documented

[mmaypumphrey]

I've finally figured out why I couldn't get any of my pre-py.saunter Python Page Object tests to run in py.saunter! I had modified them to import and use the new classes provided with py.saunter, but.... My test classes didn't start with "Check" and my test function names didn't start with "test"!

I heartily recommend saving future py.saunter new users who aren't familiar with pytest from the pain I've been suffering by documenting how pytest.ini fits in with the py.saunter framework in at least one (preferably all!) of these three places:

1. An updated README.md at the bottom of https://github.com/Element-34/py.saunter
2. The py.saunter product page at http://element34.ca/products/saunter/pysaunter
3. An expansion of the documentation available at http://packages.python.org/py.saunter/