making sure r.js is at the bottom of the page

git-svn-id: https://plugins.svn.wordpress.org/responsiveio/trunk@889371 b8457f37-d9ea-0310-8a92-e5e31aec5664
adding entry to changelog

git-svn-id: https://plugins.svn.wordpress.org/responsiveio/trunk@889374 b8457f37-d9ea-0310-8a92-e5e31aec5664