code: CssFormatter append( double value ) {
          if( value == (int)value ) {
              output.append( Integer.toString( (int)value ) );
          } else {
              output.append( decFormat.format( value ) );
          }
          return this;
      }
docs: Append a decimal number to the output.
  
  @param value the number
  @return a reference to this object