reason why eazel: URIs don't work today (real reason
	has not been figured out yet).

	* src/nautilus-applicable-views.c: (got_file_info_callback):
	Initialize default_id to NULL.

	More work towards bug 1401 (bookmark icon never updates).
	Almost done, but for a bug where bookmark for current
	location in Go menu doesn't get an icon.

	* libnautilus-extensions/nautilus-string.h,
	* libnautilus-extensions/nautilus-string.c:
	(nautilus_str_is_empty): New function, returns TRUE for
	NULL or zero-length string.

	* libnautilus-extensions/nautilus-file-attributes.h:
	Added #define for NAUTILUS_FILE_ATTRIBUTE_CUSTOM_ICON

	* libnautilus-extensions/nautilus-directory-async.c:
	Add file_info to Request struct.
	(request_is_satisfied): Renamed from ready_callback_is_satisfied;
	now takes a Request and a NautilusFile instead of a ReadyCallback.
	(call_ready_callbacks): Update existing caller for API change.
	(set_up_request_by_file_attributes): Set request's file_info
	field to TRUE if mime type requested; set request's metafile
	field to TRUE if custom icon requested.
	(nautilus_directory_check_if_ready_internal): New function,
	use request_is_satisfied to see whether specified attributes
	are available.
	* libnautilus-extensions/nautilus-directory-private.h:
	Added nautilus_directory_check_if_ready_internal.
	* libnautilus-extensions/nautilus-file.c:
	(nautilus_file_check_if_ready): Call nautilus_directory_check_
	if_ready_internal.

	* libnautilus-extensions/nautilus-icon-factory.c:
	(nautilus_icon_factory_is_icon_ready_for_file): Implemented
	this formerly nonexistent function by calling
	nautilus_file_check_if_ready

	* libnautilus-extensions/nautilus-bookmark.c:
	(nautilus_bookmark_destroy), (nautilus_bookmark_icon_is_different),
	(nautilus_bookmark_update_icon), (bookmark_file_changed_callback),
	(nautilus_bookmark_set_icon_to_default), (nautilus_bookmark_new),
	(nautilus_bookmark_new_with_icon): NautilusBookmark now keeps
	ahold of a NautilusFile internally so it can notice its
	"changed" signal. When this signal fires, the bookmark determines
	whether a changed icon is available.