Add thumbnail support.

Add thumbnail support.

2004-12-22  Anders Carlsson  <andersca@gnome.org>

	* backend/Makefile.am:
	* backend/ev-document-thumbnails.c:
	(ev_document_thumbnails_get_type),
	(ev_document_thumbnails_get_thumbnail):
	* backend/ev-document-thumbnails.h:
	* pixbuf/pixbuf-document.c: (G_DEFINE_TYPE_WITH_CODE),
	(pixbuf_document_thumbnails_get_thumbnail),
	(pixbuf_document_document_thumbnails_iface_init):
	* shell/Makefile.am:
	* shell/ev-sidebar-thumbnails.c: (ev_sidebar_thumbnails_destroy),
	(ev_sidebar_thumbnails_class_init), (ev_sidebar_thumbnails_init),
	(populate_thumbnails), (ev_sidebar_thumbnails_set_document):
	* shell/ev-sidebar-thumbnails.h:
	* shell/ev-sidebar.c: (ev_sidebar_init), (ev_sidebar_add_page),
	(ev_sidebar_set_document):
	* shell/ev-utils.c: (gaussian), (create_blur_filter),
	(create_shadow), (ev_pixbuf_add_shadow):
	* shell/ev-utils.h:
	Add thumbnail support.