title: ZXing.NET "No encoder available for format" exception
body: <p>I'm using ZXing.net to support supplying barcode encoding of values from a web service.  I have the following function which works great when used with most of the recognized encoding formats as found in the BarcodeFormat enum.  However, seven of the codes (ALL_1D, IMB, MAXICODE, MSI, RSS_14, RSS_EXPANDED, UPC_EAN_EXTENSION) result in a "No encoder available for format" exception.</p>
  
  <p>Is this an expected result; i.e., are these formats not yet supported?  Just seems they would not be recognized (not found in the enum) if they were not yet implemented.</p>
  
  <pre><code>public static Bitmap EncodeValueBarcode(string text, BarcodeFormat format, int height)
  {
      Bitmap bmp = null;
  
      var writer = new BarcodeWriter
      {
          Format = format,
          Options = new ZXing.Common.EncodingOptions()
      };
      if (height &gt; 0)
          writer.Options.Height = height;
      if (width &gt; 0)
          writer.Options.Width = width;
  
      bmp = writer.Write(text);
  
      return bmp;
  }
  </code></pre>