Update README.md and .gitignore
gitignore *.pyc
Update README.md with latest options and py.test
Add conftest.py file with args and saucelabs hooks

Conftest.py provides py.test configuration to enable:
- command line arguments
- driver fixture which handles interaction with saucelabs or defaults to local
  firefox
Re-factored tests to use PageObjectModel and py.test

Reverted to py.test to tax advantage of fixtures, test finding and tear down
test status messages to sauce labs.

Added some very basic PageObjectModel work as a starting point - test_edit_discussion needs
some pretty urgent re-factoring