Unifying versioning with downstream

This an attempt to unify versioning between:
* http://software.opensuse.org/package/openra
* http://gentoo-portage.com/games-strategy/openra
* http://archlinux.org/packages/community/any/openra/
* http://openra.ipdx.ru/deb/
* http://www.playdeb.net/software/OpenRA
* and http://openra.res0l.net/download/

to make it more comfortable to package OpenRA for various Linux distributions as well as to join @xaionaro's auto-update development servers who require `Version: bleed-$HASH` to be set.