Mathias De Maré <mathias.demare@gmail.com> [Sun, 01 Feb 2015 14:09:31 +0100] rev 23991
subrepo: add 'cat' support for git subrepos
V2: use 'self._ctx.node()' instead of 'rev' in makefileobj.
As Matt Harbison mentioned, using 'rev' does not make sense,
since we'd be passing a git revision to the top-level
Mercurial repository.