google_authenticator: fix invalid syntax
google_authenticator: store secret as hex, as it's expected by the rest of the package
google_authenticator: fix the period argument of totp
google_authenticator: formatting
google_authenticator: make GoogleAuthenticator.generate testable by allowing to pass the time referene
google_authenticator: add an helper function to produce an authenticator object from a simple base32 key
README: add lines about google authenticator support
oath: also define the __version__ variable
bump version to 1.2