Added Bulgarian, German, Slovak, Spanish translation
Compatibility with WordPress 4.0
New plugin icon for plugin installer!

git-svn-id: https://plugins.svn.wordpress.org/smooth-scroll-up/trunk@973990 b8457f37-d9ea-0310-8a92-e5e31aec5664
Tags update

git-svn-id: https://plugins.svn.wordpress.org/smooth-scroll-up/trunk@973991 b8457f37-d9ea-0310-8a92-e5e31aec5664