[geary/wip/only-incomplete] (20 commits) ...Merge branch 'master' into wip/only-incomplete

[Jim Nelson <jnelson src gnome org>]

Summary of changes:

  0e1dc91... Ctrl+Enter to send w/ inline composer: Closes bug #730542 (*)
  3a86e29... Updated Polish translation (*)
  6254599... Update AppData file (*)
  637d48f... AppData file now validates (*)
  f459fea... Updated Spanish Translation (*)
  595c842... Added title to the preferences dialog: Closes bgo#730457 (*)
  e470039... Updated Hebrew translation (*)
  ba2da59... Accounts dialog: Right justify, dim labels, no colons: Bug  (*)
  c6f5ac9... Add option to send HTML in geary-mailer (*)
  7074626... Preparing for GTK+3.10 (*)
  e9727a7... Remove Gtk.Notebook from Accounts dialog: Closes bgo#713955 (*)
  546e97b... Gtk.HeaderBar for main window and composer toolbar: Closes  (*)
  85d8872... If Folder's display name changes, signal so UI can update (*)
  e44d505... Display total count, not unread, in headerbar for Drafts/Ou (*)
  ce269c7... --enable-unity flag to deal with GtkHeaderBar issues: Refs  (*)
  415739a... Improve appearance under Unity: Closes bug #727624 (*)
  bea7179... Regression: Search upgrade prog monitor not shown (*)
  c18d2cd... Update GTK requirements in debian packaging (*)
  b5eed80... Fix endless retry loop when selecting unselectable folder (*)
  858ad7f... Merge branch 'master' into wip/only-incomplete

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