3759 Add grooveshark to sanitizer

An example embed is
<pre>
<p>
  <object width="250" height="250" allowscriptaccess="never" allownetworking="internal"> <param name="movie" value="http://grooveshark.com/widget.swf" /><param name="wmode" value="window" /><param name="flashvars" value="hostname=grooveshark.com&playlistID=100650244&p=0&bbg=000000&bth=000000&pfg=000000&amp;lfg=000000;bt=FFFFFF&pbg=FFFFFF&pfgh=FFFFFF&si=FFFFFF&lbg=FFFFFF&lfgh=FFFFFF&sb=FFFFFF&bfg=666666&pbgh=666666&lbgh=666666&sbh=666666" /></object>
</p>

<p>
  <object width="250" height="250" allowscriptaccess="never" allownetworking="internal"> <param name="movie" value="http://grooveshark.com/widget.swf" /><param name="wmode" value="window" /><param name="flashvars" value="hostname=grooveshark.com&songID=385227&style=metal&p=0" /></object>

</pre>
Editing the work is annoying as & change in to &amp;

The bits can be seen if you edit this box

https://code.google.com/p/otwarchive/issues/detail?id=3759