Update with media query

git-svn-id: https://plugins.svn.wordpress.org/wp-font-resizer/trunk@832340 b8457f37-d9ea-0310-8a92-e5e31aec5664
Modified javascript

git-svn-id: https://plugins.svn.wordpress.org/wp-font-resizer/trunk@832341 b8457f37-d9ea-0310-8a92-e5e31aec5664