Updated to AdWords API v201209
[v201209] removed obsolete field Campaign.TargetContentContextual
[v201209][FIX] weird no_method_error in test by downgrading shoulda-matchers gem

More info here:
https://github.com/thoughtbot/shoulda-matchers/issues/235
[v201209] switched authorization to OAuth2
[v201209] changed config_test to oauth2
[v201209] updated README