Added a proper toString() to SerializerRegistration.

git-svn-id: https://jmonkeyengine.googlecode.com/svn/trunk@8941 75d07b2b-3a1a-0410-a2c5-0572b91ccdca

engine/src/networking/com/jme3/network/serializing/SerializerRegistration.java

@@ -75,4 +75,8 @@ public final class SerializerRegistration {
     public Class getType() {
         return type;
     }
+    
+    public String toString() {
+        return "SerializerRegistration[" + id + ", " + type + ", " + serializer + "]";
+    }
 }