Use Ushahidi 'best practice' method for JS hooking

[evoltech]

We are currently performing a clever hack for getting our custom JS in, but there us a standard way of already doing this. Consider how InfoWindow does this

  public function register_script(){
    plugin::add_javascript("InfoWindow/media/js/jquery.pagination");
    echo plugin::render("javascript");
    echo "<script src=\"".url::base()."infowindow\"></script>";
  }