20px margin-bottom added, order of CSS rules improved

git-svn-id: https://plugins.svn.wordpress.org/ductile-responsive-video/trunk@977213 b8457f37-d9ea-0310-8a92-e5e31aec5664
Stable tag: 1.1.0

git-svn-id: https://plugins.svn.wordpress.org/ductile-responsive-video/trunk@977218 b8457f37-d9ea-0310-8a92-e5e31aec5664