Initialize the URLAdapter properly

also the last commit was from me i got a new computer and forgot to
configure my git properly sorry

src/de/gurkenlabs/litiengine/util/io/XmlUtilities.java

@@ -94,6 +94,7 @@ public static <T> T read(Class<T> cls, URL path) throws JAXBException {
     }
 
     final Unmarshaller um = jaxbContext.createUnmarshaller();
+    um.setAdapter(new URLAdapter(path));
 
     return cls.cast(um.unmarshal(path));
   }