Merge pull request #6 from qixiaobo/fix-group-for-register

dubbo group not set for reference  
diff --git a/src/main/java/org/apache/dubbo/proxy/service/GenericInvoke.java b/src/main/java/org/apache/dubbo/proxy/service/GenericInvoke.java
index 2783361..eccdcd8 100644
--- a/src/main/java/org/apache/dubbo/proxy/service/GenericInvoke.java
+++ b/src/main/java/org/apache/dubbo/proxy/service/GenericInvoke.java
@@ -27,6 +27,7 @@
     private static void init() {
         RegistryConfig registryConfig = new RegistryConfig();
         registryConfig.setAddress(registry.getUrl().getProtocol() + "://" + registry.getUrl().getAddress());
+        registryConfig.setGroup(registry.getUrl().getParameter(org.apache.dubbo.common.constants.CommonConstants.GROUP_KEY));
         applicationConfig = new ApplicationConfig();
         applicationConfig.setName("dubbo-proxy");
         applicationConfig.setRegistry(registryConfig);