[gnome-shell] (7 commits) Non-fast-forward update to branch issue-23

[Florian Müllner <fmuellner src gnome org>]

The branch 'issue-23' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  704eb9d... altTab: Update the switcher when apps and/or windows get st
  1dc8e94... altTab: Add shortcut to quit application
  9957f76... switcherPopup: Handle removal of items from SwitcherPopup
  166dbe6... altTab: Add also a shortcut to close windows from the switc

Commits added to the branch:

  9dbe108... calendar: Make month and month-year formats translatable (*)
  a647445... calendar Preparing for genitive/nominative months (*)
  f2d12e2... Update Polish translation (*)
  5122b06... altTab: Update the switcher when apps and/or windows get st
  a3918d8... altTab: Add shortcut to quit application
  06f790d... switcherPopup: Handle removal of items from SwitcherPopup
  d63c0e2... altTab: Add also a shortcut to close windows from the switc

(*) This commit already existed in another branch; no separate mail sent