title: Adding text to an image with Carrierwave and mini_magick
body: <p>I'm trying to put text on an image via carrierwave and mini_magic. The code runs without erros, but the resulting image has no text on it.</p>
  
  <pre><code>version :text do
     process :put_text_stamp
  end
  
  def put_text_stamp
    manipulate! do |img|
      img.combine_options do |c|
        c.gravity 'Center'
        c.fill 'red'
        c.pointsize '22'
        c.draw "text 0,0 'TEXT'"
      end
      img = yield(img) if block_given?
      img
    end
  end
  </code></pre>