Get the default data for a bundle.

        @param bundle_id The bundle's id.
        @param channel Optional channel name.

def bundle(self, bundle_id, channel=None):
        '''Get the default data for a bundle.

        @param bundle_id The bundle's id.
        @param channel Optional channel name.
        '''
        return self.entity(bundle_id, get_files=True, channel=channel)