code: function(code, cb) {
          var self = this;
          this.oauthClient.getToken(code, function(err, token) {
              if (err) {
                  cb({
                      err: err,
                      msg: 'Error while trying to retrieve access token'
                  });
                  return;
              }
              self.storeToken(token);
              cb(null, {
                  resp: token,
                  msg: "Google auth code successfully set"
              });
          });
      }
docs: Used to set the code provided by the generated auth url.
  This code is generated for a user and is needed to initiate the oauth2 handshake
  
  @param  code  the code obtained by a user from the auth url