[LightDM] LightDM 0.4.0 released

[Robert Ancell]

I've just released version 0.4.0 of LightDM:
http://people.ubuntu.com/~robert-ancell/lightdm/releases/lightdm-0.4.0.tar.gz

This release took a lot longer than I wanted, mostly due to the
difficulty of getting regression tests set up (system processes really
don't like being tested without accessing the system).  But the good
news is we now have 8 tests, you can run these using 'make check'.  I
plan to add a lot more over time, and this should make it a lot harder
to have regressions from now on.

Other things of note:
- There were a number of crashes that have been fixed and also the
code is more paranoid about NULL checking.  There may be more issues
so please test thoroughly!
- There were a number of issues with signal handling that have now
been fixed.  This should make LightDM shutdown more reliably.
- Some changes to the API to have more sane names, see
ldm_greeter_login and ldm_greeter_start_session (and the Qt
equivalents).  This will require greeters to be updated to work in
0.4+
- I've moved the config file from /etc/ to /etc/lightdm/.  This is to
allow more configuration files for new features that will be coming.
- Autologin now correctly uses PAM to authenticate, previously it did
not so sessions may not have all their services started.

--Robert