Throw in a quick event hook to override the profile list type on showstream (should...

Throw in a quick event hook to override the profile list type on showstream (should be made more general in future).
Replace with a NoticeList to have output include avatar and username -- but CSS still hides them in default theme.

Event::addHandler('ShowStreamNoticeList', 'awesome');
function awesome($notice, $action, &$pnl)
{
    $pnl = new NoticeList($notice, $action);
    return false;
}