Don't force authentication for googleauth requests

otherwise we end up in a loop.
Bump version.
Add force_auth_on_all_request feature.
Fix coding style.
Add documentation.
Don't update the version

it's up to the upstream project to do it.
Bump version.
Ignore virtual env (venv) directory.
Add flake8 configuration via tox.ini
Fix syntax error

and comply with flake8.
Bump version.
Merge pull request #9 from lyft/master

Add force_auth_on_every_request option