Support for gnome-keyring for encrypted PDF's.

Support for gnome-keyring for encrypted PDF's.

	* configure.ac:
	* data/evince-password.glade:
	* shell/ev-password.c: (ev_password_dialog_set_property),
	(ev_password_dialog_finalize), (ev_password_dialog_class_init),
	(ev_password_dialog_init), (ev_password_set_bad_password_label),
	(ev_password_dialog_entry_changed_cb),
	(ev_password_dialog_entry_activated_cb),
	(ev_password_dialog_save_password), (ev_password_keyring_found_cb),
	(ev_password_search_in_keyring), (ev_password_dialog_get_password),
	(ev_password_dialog_set_bad_pass):
	* shell/ev-password.h:
	* shell/ev-window.c: (password_dialog_response),
	(ev_window_popup_password_dialog):

	Support for gnome-keyring for encrypted PDF's.