make ucode with pack.gz work again

Closes #94

src/main/java/com/threerings/getdown/data/Resource.java

@@ -334,7 +334,8 @@ public class Resource implements Comparable<Resource>
 
     protected static boolean isPacked200Jar (String path)
     {
-        return path.endsWith(".jar.pack") || path.endsWith(".jar.pack.gz");
+        return path.endsWith(".jar.pack") || path.endsWith(".jar.pack_new") ||
+            path.endsWith(".jar.pack.gz")|| path.endsWith(".jar.pack.gz_new");
     }
 
     protected String _path;

src/main/java/com/threerings/getdown/util/FileUtil.java

@@ -177,7 +177,7 @@ public class FileUtil
             extractedJarFileOut = new FileOutputStream(target);
             jarOutputStream = new JarOutputStream(extractedJarFileOut);
             packedJarIn = new FileInputStream(packedJar);
-            if (packedJar.getName().endsWith(".gz")) {
+            if (packedJar.getName().endsWith(".gz") || packedJar.getName().endsWith(".gz_new")) {
                 packedJarIn = new GZIPInputStream(packedJarIn);
             }
             Pack200.Unpacker unpacker = Pack200.newUnpacker();