Add support for ConnectionFactory.newInstance() usage

   public static ConnectionFactory newInstance() throws JAXRException
   {
      String factoryName = null;
      ConnectionFactory factory = null;
      try
      {
         String defaultName = null;
         factoryName = System.getProperty(SYS_PROP_NAME, defaultName);
         ClassLoader loader = Thread.currentThread().getContextClassLoader();
         Class factoryClass = loader.loadClass(factoryName);
         factory = (ConnectionFactory) factoryClass.newInstance();
      }
      catch(Throwable e)
      {
         throw new JAXRException("Failed to create instance of: "+factoryName, e);
      }
      return factory;
   }