title: I can't get rails plugin wicked_pdf to work
body: <p>I wanted to create PDFs for my rails application using wkhtml2pdf and wicked_pdf.<br>
  I downloaded and extracted wkhtml2pdf beta 4 and placed it in /usr/local/bin/wkhtml2pdf<br>
  I tried running it on a web site and it gave a nice result.</p>
  
  <p>In my rails application (2.3.4) I installed wicked_pdf:  </p>
  
  <blockquote>
    <p>script/plugin install git://github.com/mileszs/wicked_pdf.git<br>
    script/generate wicked_pdf</p>
  </blockquote>
  
  <p>Everything seemed to be ok.
  inside script/console I run the following - (with the following output)</p>
  
  <pre><code>wp = WickedPdf.new
  </code></pre>
  
  <p>=># WickedPdf:0xb62f2c70 @exe_path="/usr/local/bin/wkhtmltopdf"</p>
  
  <pre><code>HTML_DOCUMENT = "&lt;html&gt;&lt;body&gt;Hello World&lt;/body&gt;&lt;/html&gt;"
  </code></pre>
  
  <p>=> "<code>&lt;html&gt;&lt;body&gt;Hello World&lt;/body&gt;&lt;/html&gt;"</code></p>
  
  <pre><code>pdf = wp.pdf_from_string HTML_DOCUMENT
  </code></pre>
  
  <p>=> "/usr/local/bin/wkhtmltopdf - - -q"</p>
  
  <p>=> "\n\n\n\n\n\n\n\n\n\n"</p>
  
  <p>of course this isn't good. According to the test the result of my last command should start with "%pdf-1.4"</p>
  
  <p>Any idea what I can do?</p>