js injected feed

feed.xml

<?xml version="1.0" encoding="utf-8"?>
<feed xmlns="http://www.w3.org/2005/Atom" xmlns:dc="http://purl.org/dc/elements/1.1/" xml:lang="en">
  <title type="html">Demo feed</title>
  <subtitle type="html">Strip out JS demo feed</subtitle>
  <link rel="self" type="application/atom+xml" href="https://gist.github.com/cosenal/" />
  <link rel="alternate" type="text/html" href="https://gist.github.com/"/>
  <id>https://gist.github.com/</id>
  <updated>2015-02-11T16:22:02+01:00</updated>
    <entry>
      <title type="html">Demo entry</title>
      <link rel="alternate" type="text/html" href="https://gist.github.com/cosenal/b803844b747e180cec92/" />
      <published>2015-02-11T15:54:03+01:00</published>
      <updated>2015-02-11T15:54:03+01:00</updated>
      <id>https://gist.github.com/cosenal/b803844b747e180cec92/</id>
        <author>
          <name>cosenal</name>
        </author>
        <summary type="html">
        &lt;!DOCTYPE html&gt;
        &lt;html lang=&quot;en&quot;&gt;
        &lt;head&gt;
        &lt;/head&gt;
        &lt;body&gt;
        TEST TEST TEST
        &lt;script type=&quot;text/javascript&quot;&gt;
        var IVW=&quot;42#&quot;;
        &lt;/script&gt;
        &lt;/body&gt;
        </summary>
    </entry>
</feed>