Make Credentials deserialization resilient to moves in oauth2client location. Reviewed in http://codereview.appspot.com/5698049/.
Make Credentials deserialization resilient to moves in oauth2client location.
Reviewed in http://codereview.appspot.com/5698049/.

jonparrott/oauth2client,google/oauth2client,jonparrott/oauth2client,googleapis/oauth2client,googleapis/oauth2client,googleapis/google-api-python-client,google/oauth2client,googleapis/google-api-python-client,clancychilds/oauth2client,clancychilds/oauth2client