Use the new explorer core jar.

examples/counter-rest/server-explorer-war/pom.xml

@@ -82,7 +82,7 @@
     <!-- Include in the war the FraSCAti Explorer. -->
     <dependency>
       <groupId>org.ow2.frascati</groupId>
-      <artifactId>frascati-explorer</artifactId>
+      <artifactId>frascati-explorer-core</artifactId>
       <version>${project.version}</version>
     </dependency>
   </dependencies>