Allow to change orientation on the fly

[stefanwalther]

If you are changing the orientation on the fly you'll end up in something like that:

class="ngrs-range-slider ngrs-horizontal ngrs-vertical ngrs-left ngrs-right"

To be able to get it working, I have removed the all possible classes first.

Regards Stefan

[stefanwalther]

Now added some other stuff, orientation can now be changed on the fly.