Make output compatible when xdebug is installed

It doesn't work with the xdebug extension installed. I see escaped HTML from a
  `var_dump` as the contents of the output.

  Example:

    ../var/www/testing/index.php:10

    8 $a = array('a' => 'b');
    9    
    10 trace($a);

    1 <pre class='xdebug-var-dump' dir='ltr'>
    2 <b>array</b> <i>(size=1)</i>
    3   0 <font color='#888a85'>=&gt;</font> &amp;
    4    <b>array</b> <i>(size=1)</i>
    5      'a' <font color='#888a85'>=&gt;</font> <small>string</small> <font color='#cc0000'>'b'</font> <i>(length=1)</i>
    6 </pre>