ephy-toolbar: Fix the margin on the left side of the separator

https://bugzilla.gnome.org/show_bug.cgi?id=707091
ephy-window: Fix the margin of the toolbar

https://bugzilla.gnome.org/show_bug.cgi?id=707091
Updated Polish translation
search-provider: fix string comparison

Otherwise the provider won't update the string in the shell search
overview.

https://bugzilla.gnome.org/show_bug.cgi?id=707204
data: add appdata file for web
test-ephy-web-view: change search url to DDG

This is hardcoded here and necessary for the test to pass.
Updated POTFILES.in and POTFILES.skip
Updated Polish translation
Updated Lithuanian translation
Updated Slovenian translation
test-ephy-embed-shell: Do not assume XDG_DATA_DIRS is set

Otherwise the test will fail in systens where this is unset.
ephy-toolbar: Do not hardcode title style of a web-app

Let the css theme define the title style.

https://bugzilla.gnome.org/show_bug.cgi?id=707246
Require GTK 3.9.12

We now use gtk_button_new_from_icon_name, first found in GTK 3.9.12.
ephy-find-toolbar: Port to GtkSearchBar

Also fix the appearance of the prev/next buttons.

https://bugzilla.gnome.org/show_bug.cgi?id=707086
ephy-find-toolbar: Remove cast macros from places where it's not needed

https://bugzilla.gnome.org/show_bug.cgi?id=707086
Drop GtkStock

https://bugzilla.gnome.org/show_bug.cgi?id=707021
Updated Galician translations
Updated Spanish translation
data: fix distcheck again
ephy-web-view: fix the search url when settings unavailable

Another hardcoded google instance.