Fade opacity 0 fix

Change to opacity zero so we don't have ghost images
Always add animation name to the slide container

This just adds more consistency. Now we can target slide animations better in CSS now as well.
I had to bring back the vendor prefixes. The slide animation did not work at all without them.
Fixed paused button color
Fixed JS error with Circular set to false
Orbit elements hide for small

3 new variables to control if various elements will be shown on mobile.

$orbit-nav-hide-for-small: true;
$orbit-bullet-hide-for-small: true;
$orbit-timer-hide-for-small: true;
Merge pull request #4812 from joeworkman/orbit-patch

More Orbit bug fixes