Add subdomain support

I upgraded my account and it looks like they're not supported. I don't know javascript but I compared the javascript Woopra provided against the javascript in the module and was able to figure it out. If anyone else needs subdomain support in the mean time, here's the corrected function:

function woopra_footer($main = 0) {
  global $user;
  global $base_url;
  $script = '';
  if (arg(0) != 'admin') {
    if ((_woopra_track($user))) {
      $woopra_js = '//static.woopra.com/js/woopra.v2.js';
      $script .= "<script type=\"text/javascript\" src=\"$woopra_js\"></script>\n";
      $script .= "<script type=\"text/javascript\">\n  woopraTracker.setDomain(\"example.com\");\n</script>\n";
      $script .= "<script type=\"text/javascript\">\n  woopraTracker.track();\n</script>\n";
    }
  }
  return $script;
}

You'll need to change "example.com" up there to your root domain. Ideally this would be a variable set in settings rather than hardcoding it in the module, of course, but this works for now.

Michelle