def revisions(self, path, max_revisions):
raise NotImplementedError<EOL>
Get the list of revisions.

:param path: the path to target.
:type  path: ``str``

:param max_revisions: the maximum number of revisions.
:type  max_revisions: ``int``

:return: A list of revisions.
:rtype: ``list`` of :class:`Revision`