I kept hitting the error 'NameError: uninitialized constant
ImageWarehouseObject::ImageDescriptorXML' while creating assemblies.
This patch requires image_descriptor_xml in image_warehouse_object where
it's referenced.
As a quick smoke test, "Assembly.create!(:name => 'foo',
:architecture => 'x86_64')" should raise the exception above until this
patch is applied.