bundlespec: introduce an attr-based class for bundlespec
We will add support of contentops in the next patch, introduce a class instead
of returning a 4-items tuple.
Differential Revision: https://phab.mercurial-scm.org/D2971
# name space package to host third party extensions
from __future__ import absolute_import
import pkgutil
__path__ = pkgutil.extend_path(__path__, __name__)