[geary/wip/713150-conversations] (7 commits) ...Merge branch 'master' into wip/713150-conversations

[Jim Nelson <jnelson src gnome org>]

Summary of changes:

  30500a7... Set the window decoration buttons correctly in GTK >= 3.12 (*)
  cbed345... Clear composer header title when detaching window (*)
  577b5fd... Set information in titlebar under Unity (*)
  a9a71a6... Updated Hungarian translation (*)
  72b2648... Don't set composer title when inline new (*)
  98be06d... Avoid critical errors when creating multiple application me (*)
  a71a3b3... Merge branch 'master' into wip/713150-conversations

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