Added functionality: you can now set a minimum and/or maximum screen size where the element should be sticky (handy for responsive designs, should you not want your element to be sticky below or above certain screen sizes).

git-svn-id: https://plugins.svn.wordpress.org/sticky-menu-or-anything-on-scroll/trunk@1006057 b8457f37-d9ea-0310-8a92-e5e31aec5664