[Merge] lp:~stgraber/upstart/upstart-session-socket into lp:upstart

[Stéphane Graber]

Alright, I think the current version of the branch matches the spec.

I also included a change to upstart itself, so that --user doesn't mean that it'll listen to the session bus, if you want to force it to listen to the session bus and do user session stuff, --session --user is what you want.
-- 
https://code.launchpad.net/~stgraber/upstart/upstart-session-socket/+merge/143344
Your team Upstart Reviewers is requested to review the proposed merge of lp:~stgraber/upstart/upstart-session-socket into lp:upstart.