Merge branch 'maint'

Merge branch 'maint'

* maint:
  Start preparing Release Notes for 1.5.0.3
  Documentation: git-remote add [-t <branch>] [-m <branch>] [-f] name url
  Include config.mak in doc/Makefile
  git.el: Set the default commit coding system from the repository config.
  git-archimport: support empty summaries, put summary on a single line.
  http-push.c::lock_remote(): validate all remote refs.
  git-cvsexportcommit: don't cleanup .msg if not yet committed to cvs.