Options page compatible with WordPress Settings API
Compatibility with WordPress 4.0

git-svn-id: https://plugins.svn.wordpress.org/smooth-scroll-up/trunk@979209 b8457f37-d9ea-0310-8a92-e5e31aec5664
Readme update

git-svn-id: https://plugins.svn.wordpress.org/smooth-scroll-up/trunk@979218 b8457f37-d9ea-0310-8a92-e5e31aec5664
POT file update

git-svn-id: https://plugins.svn.wordpress.org/smooth-scroll-up/trunk@979228 b8457f37-d9ea-0310-8a92-e5e31aec5664