title: Prawn templates not working
body: <p>I´m trying this simple script:</p>
  
  <pre><code>require 'prawn'
  
  template_file_name = File.join(File.dirname(__FILE__), 'template.pdf')
  pdf_file = Prawn::Document.new(:template =&gt; template_file_name)
  pdf_file.text('Hello World')
  pdf_file.render_file('output.pdf')
  </code></pre>
  
  <p>There is a template.pdf file in the same dir as the script but the output.pdf comes only with the Hello Wordl</p>
  
  <p>Is there anything else that I should be concerned of?</p>
  
  <p>Thanks</p>