Initial code import
Initial test import.
setup.py now includes install requirements.
Packaging import structure.

This commit revises the structure of this project such that the
relevant class is imported in `service_account_auth.__init__.py`. This
change makes imports of the project code simpler.
setup.get_version fix.
Travis-CI support.
travis flake8 syntax fix
Readme documentation.
Removed print statements
Merge pull request #2 from Wilduck/initial-code-import

Initial code import