v2.1.0

Now creates a class of "trig-scroll-top" or "trig-scroll-bottom" onto the body of the document depending on the last scroll position. To give the ability to make something happen at different break points down the page. The classes "trig-scroll-25", "trig-scroll-50" and "trig-scroll-75" are added to the body of the document depending on the scroll position percentage down the page.