code: @Transformer(requireTemplate = true)
      public static String formatCurrency(Object data) {
          return formatCurrency(null, data, null, null);
      }
docs: Transformer method. Format given data into currency
  
  @param data
  @return the currency
  See {@link #formatCurrency(org.rythmengine.template.ITemplate,Object,String,java.util.Locale)}