v0.4.0

Version v0.4.0

This is a bugfix release. It is a major version number since the
dependencies have changed.

Dependency changes
------------------

* Dbus is now a mandatory dependency (python-dbus)

Bug fixes
---------

* Dragbox handles a stale environment much better. As a side effect, it does
  not use or respect `DBUS_SESSION_BUS_ADDRESS` anymore.

Ulrik Sverdrup (10):
      Fix small spelling error in man page
      Add git export-subst variables to version.py.in
      Add try..except around dbus.SessionBus
      get_dbus_names: Catch exception if dbus is unavailable
      Check for available X DISPLAY when creating window
      Unset DBUS_SESSION_BUS_ADDRESS to defend against stale environment
      Make dbus a mandatory dependency
      Update man page.
      NEWS for Version 0.4
      configure.ac: Mark as version 0.4.0
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