Update build requirements

added libprocps-dev
Added support for portage and linuxdcpp
described more accurately emerge process
Merge pull request #3 from Szpadel/master

Support for Gentoo
Update simple.d/sessions.conf (inactive_user.useless labels)

- update description
- add firefox and firefox.real next to firefox-bin - thanks Szpadel.
- do not inherit label for chrome
Update simple.d/sessions.conf (inactive_user.useless labels)

- update description
- add firefox and firefox.real next to firefox-bin - thanks Szpadel.
- do not inherit label for chrome
Merge branch 'master' into xdg_sessions
workaround: we don't want su'ed / sudo'ed processes to be idle

- add workaround to other subsystems
fix scheduling of {user,daemon}.idle flagged processes

daemon.idle: match only processes running outside user session
user.idle: match only process running inside user session