Patch to support zip protocol type

Hey guys,

Within weblogic, we're attetmpting to lookup a composite using the Node api, but the protocol that's returned when this is looked up starts "zip:" which is not covered by the transport code in either of NodeImpl.java or DefaultSCADomain.java, the following will modify this url appropriately in line with the other protocol code:

} else if ("zip".equals(protocol)) {
// zip contribution, remove the zip prefix and pad with file:
String location = "file:"+url.substring(4, url.lastIndexOf("!/"));
contributionURL = FileHelper.toFile(new URL(location)).toURI().toURL();