pushing does not update refs

[fingolfin]

pushing changes made in git to hg does not update the refs properly. hence it looks as if the remote was out-of-date. Only after manually doing a pull are the refs updated. This is usually not a major issue, but annoying nevertheless, and should be fixed..

It seems alexsydell spent some effort on this, perhaps some of his work can be adapted or even used directly: https://github.com/alexsydell/gitifyhg/tree/work_in_progress