Minor changes

git-svn-id: https://plugins.svn.wordpress.org/smooth-scroll-up/trunk@791808 b8457f37-d9ea-0310-8a92-e5e31aec5664
Compatibility with WordPress 3.7

git-svn-id: https://plugins.svn.wordpress.org/smooth-scroll-up/trunk@793439 b8457f37-d9ea-0310-8a92-e5e31aec5664