Bugfix/multi choice carousel

This fixes the mult-choice component, which animates via th-carousel.

Also added two attributes to th-carousel: 
- animateOn (options are: tap, interval, or none)
- interval (takes an integer to determine the time between panel when animateOn is set to 'interval')

I tried to make invisible backfaces as the default because when the component loads, the backfaces show for a second before disappearing. But this did not fix it - any ideas how to get rid of that?