Removes an existing task directory.

            `task_name`
                Task name.

            Returns ``True`` if removal successful.

def remove(self, task_name):
        """ Removes an existing task directory.

            `task_name`
                Task name.

            Returns ``True`` if removal successful.
            """

        try:
            task_dir = self._get_task_dir(task_name)
            shutil.rmtree(task_dir)
            return True

        except OSError:
            return False