Update SPPM

Update SPPM

	* info/sppm.texi (IRC): JackaLX -> SteveYoungs

	* info/sppm.texi (Voting): Votes to be decided by simple majority,
	which I think is easier and fairer.

	* info/sppm.texi (Sending a patch from a git repo): Update, use
	the "for-steve" workflow, encourage GnuPG signing, mention and
	recommend git-for-steve.sh.

	* info/sppm.texi (Making Releases): Update to bring it inline with
	what I actually do on release day.

	* info/sppm.texi (Compatibility): Clarify a little.

	* info/sppm.texi (Setting up a publicly accessible repo):
	Explicitly use `git-for-steve.sh' in the example setup, and
	mention it in the text.

	* info/sppm.texi (Other Developers' Repositories): Add everyone's
	repo that I know of.

Signed-off-by: Steve Youngs <steve@sxemacs.org>