Proper XML encoding for title and URL in torrentleech.py

This is my first pull request so please bear with me. 

An `&' in the title and/or URL of a show, for example "Ben 10 Original & Alien Force & Ultimate Alien & Omniverse Complete", will create an invalid XML file that will result in an error:

Error:
        SEARCHQUEUE-RSS-SEARCH :: Error trying to load TorrentLeech RSS feed: not well-formed (invalid token): line 1, column 10544

Invalid XML:

        <item>
        <title>Ben 10 Original & Alien Force & Ultimate Alien & Omniverse Complete</title>
        <link>http://www.torrentleech.org/download/Ben.10.Original.&.Alien.Force.&.Ultimate.Alien.&.Omniverse.Complete.torrent</link>
        </item>

I've added XML escaping for the Title and URL encoding for the URL:

        <item>
        <title>Ben 10 Original &amp; Alien Force &amp; Ultimate Alien &amp; Omniverse Complete</title>
        <link>http://www.torrentleech.org/download/Ben.10.Original.%26.Alien.Force.%26.Ultimate.Alien.%26.Omniverse.Complete.torrent</link>
        </item>