move the slide-number out of the controls to a proper position and little fix to the updating event.

the *.min.js didn't chaged yet.

They looked a little wonky if you used a G or a Y.

the old one was pink. while I don't have anything against pink, I just thought it might be good to make the highlight color dark brown instead.

themes are now available as separate css files under css/theme/, old theme option in config is no longer supported (closes #104)