[gnome-session] Created tag 3.15.4

[Ray Strode <halfline src gnome org>]

The unsigned tag '3.15.4' was created.

Tagger: Ray Strode <rstrode redhat com>
Date: Thu Jan 29 10:54:56 2015 -0500

    Version 3.15.4
    
    * Allow turning on debugging with an environment variable
    * Don't set DISPLAY in wayland sessions
    * Add back session-name property
    * Translation updates

Changes since the last tag '3.15.3':

Andika Triwidada (1):
      Updated Indonesian translation

Bernd Homuth (1):
      Updated German translation

Daniel Martinez (1):
      Update Aragonese translation

Fabio Tomat (1):
      Updated Friulian translation

Inaki Larranaga Murgoitio (1):
      Updated Basque language

Matej Urbančič (1):
      Updated Slovenian translation

Ray Strode (6):
      main: allow turning on debugging from environment variable
      autostart: don't set DISPLAY in autostarted apps for wayland sessions
      main: support GNOME_SESSION_DEBUG=0 and GNOME_SESSION_DEBUG=1
      manager: add back session-name property
      NEWS: update for release
      configure: bump to 3.15.4

Ricardo  Barbosa (1):
      Updated Brazilian Portuguese translation

Stas Solovey (1):
      Updated Russian translation

Sveinn í Felli (1):
      Updated Icelandic translation