Improve documentation and tidy up code
Improve documentation and tidy up code

Kianoosh76/UIScrollView-InfiniteScroll,Kianoosh76/UIScrollView-InfiniteScroll,pronebird/UIScrollView-InfiniteScroll,Kianoosh76/UIScrollView-InfiniteScroll,pronebird/UIScrollView-InfiniteScroll,pronebird/UIScrollView-InfiniteScroll