Fix JsInterop in 2.8-SNAPSHOT

gwtquery-core/src/test/java/com/google/gwt/query/client/GQueryJsInteropTestGwt.java

     }
   }
 
-  @JsType(prototype = "Window", isNative = true)
+  @JsType(prototype = "Window")
   public interface HTMLWindow {
       @JsProperty String getName();
       @JsProperty void setName(String name);
   }
 
-  @JsType(prototype = "Window", isNative = true)
+  @JsType(prototype = "Window")
   public interface HWindow {
       @JsProperty HDocument document();
   }
 
-  @JsType(prototype = "HTMLDocument", isNative = false)
+  @JsType(prototype = "HTMLDocument")
   public interface HDocument {
       HElement createElement(String tag);
   }
   
-  @JsType(prototype = "HTMLElement", isNative = false)
+  @JsType(prototype = "HTMLElement")
   public interface HElement {
       @JsProperty void id(String s);
   }

pom.xml

     </repositories>
 
     <properties>
-        <gwtversion>2.7.0</gwtversion>
-        <gwtmaven>2.7.0</gwtmaven>
+        <gwtversion>2.8.0-SNAPSHOT</gwtversion>
+        <gwtmaven>2.8.0-SNAPSHOT</gwtmaven>
         <gqueryclassifier />
         <gwt.loglevel>INFO</gwt.loglevel>
         <gwt.outputstyle>OBF</gwt.outputstyle>