Support previewing of password protected PDFs

Delay changing the window mode when loading a document, so that we are
still in the overview when presenting the dialog to enter the password.
We switch the mode to preview when load-finished or load-error has
been received.

https://bugzilla.gnome.org/show_bug.cgi?id=700716
Updated POTFILES.in
Updated Czech translation
Port to gnome-online-miners

Adjust the D-Bus names and interfaces, and nuke the miner code.

https://bugzilla.gnome.org/show_bug.cgi?id=703852
release: prepare for 3.9.4
Updated Spanish translation
sharing: add a link to the original JS email validator

And clarify the copyright/license for that piece of code.
Updated slovak translation
Updated Norwegian bokmål translation
searchbar: Fix delayed search usage for latest GTK+

And bump the GTK+ requirement to make this work.
Updated Hebrew translation.
Updated Traditional Chinese translation(Hong Kong and Taiwan)
Updated Galician translations
Updated German translation
Added Irish translation
Updated Brazilian Portuguese translation
doap: add Debarshi to the maintainers
selections: Implement the new selection toolbar

Changes from the existing toolbar include:
  + It slides up from the bottom instead of being overlaid.
  + The buttons are labelled with strings instead of icons.
  + The toolbar is always shown irrespective of content selection. We
    don't hide the buttons either. Instead of insensitize them.
  + Using a Gtk.HeaderBar simplifies the layout.

https://bugzilla.gnome.org/show_bug.cgi?id=699910
mainToolbar: Use a "Cancel" button instead of "Done"

https://bugzilla.gnome.org/show_bug.cgi?id=699910
selections: Exit the selection mode when an action has been performed

If the action opens a modal dialog then we only exit the mode when the
"response" from the dialog has been positive.

https://bugzilla.gnome.org/show_bug.cgi?id=699910