Added settings to control fade animation speed

New SCSS variables to control the animation speed for the new fade CSS transition.
Stack on Small now works with Fade

In the JS, I add the stack_on_small class first. This way if the visitor is on mobile, the display:none style gets applied to all the other elements like bullets before they are even created.

In the SCSS, I force the opacity to be 1 and disable the css animations.
Fixed bullet styles when slideshow wrapper is used

When you use the slideshow-wrapper, then its styles override the bullet styles and make them display:block. I simply moved the bullet styles to be nested inside the orbit-container.
Move preloader styles inside wrapper

I did this so that the preloader styles are only applied to the styles inside the slideshow-wrapper. preloader is a pretty generic class so we don't want to step on any toes even though  you can customize the class name.
Preloader class setting

Since this is a variable in SCSS, it should be here as well.
Merge pull request #4796 from joeworkman/orbit-patch

Orbit - Bug fixes