Get the Twitter API keys. Order of precedence is command line,
        environment, config file. Return True if all the keys were found
        and False if not.

def get_keys(self):
        """
        Get the Twitter API keys. Order of precedence is command line,
        environment, config file. Return True if all the keys were found
        and False if not.
        """
        env = os.environ.get
        if not self.consumer_key:
            self.consumer_key = env('CONSUMER_KEY')
        if not self.consumer_secret:
            self.consumer_secret = env('CONSUMER_SECRET')
        if not self.access_token:
            self.access_token = env('ACCESS_TOKEN')
        if not self.access_token_secret:
            self.access_token_secret = env('ACCESS_TOKEN_SECRET')

        if self.config and not (self.consumer_key and
                                self.consumer_secret and
                                self.access_token and
                                self.access_token_secret):
            self.load_config()