updated salt-git package with salt-master user "salt"

I've updated the salt-git archlinux package:
New features: 
- salt-master running under own user 'salt'
- package checks if salt-master or salt-minion was running and reexec/reload daemons.
- user 'salt' has is a system user with home dir /srv/salt
- upon removal of package it will clean up cache dir/log dir but keep /srv/salt
- package will install logrotate config in appropriate place.
- package will install bash-completion in appropriate place.