For certain distributions, like FC16, it doesn't have close button in
sub-windows or dialogs. Therefore we need to add an "Close" button to
"BinbDialog" to close the dialog.
Besides, let BinbDialog inherits the CrumbsDialog instead of gtk.Dialog
(Bitbake rev: 5d33c355001bec91f4e4c3860db8d7ac2b449782)
Signed-off-by: Dongxiao Xu <dongxiao.xu@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>