Tag release 2.3.25

Merge pull request chaos#6 from garlick/rhel7

allow systemd to manage /var/run/powerman

prep for 2.3.23

prep for 2.3.22 tag

Merge pull request chaos#3 from garlick/rhel7

rhel7 support and prep for 2.3.21 release

prep for 2.3.20 tag

AUTHORS: alphabetize and add contributors

prep for 2.3.18 tag

prep for 2.3.17 tag + autogen

prep for 2.3.16 tag + autogen