[gnome-shell] Created tag 3.18.4

[Florian Müllner <fmuellner src gnome org>]

The unsigned tag '3.18.4' was created.

Tagger: Florian Müllner <fmuellner gnome org>
Date: Thu Mar 3 15:43:54 2016 +0100

    Tag release 3.18.4

Changes since the last tag '3.18.3':

Andika Triwidada (1):
      Updated Indonesian translation

Daniel Korostil (1):
      Updated Ukrainian translation

Florian Müllner (2):
      altTab: Fix window-switcher on HiDPI displays
      Bump version to 3.18.4

Kristjan SCHMIDT (1):
      Updated Esperanto translation

Lubomir Rintel (1):
      NetworkAgent: correctly identify the VPN secret requests

Michael Catanzaro (3):
      loginDialog: Fix TypeError when user is deleted
      loginDialog: Reconsider user for user list when user changes
      authPrompt: Do not allow bypassing disabled Sign In button