Updated for 3.9 support

git-svn-id: https://plugins.svn.wordpress.org/client-proof-visual-editor/trunk@945189 b8457f37-d9ea-0310-8a92-e5e31aec5664
Removed the "Remove Formatting" button, and updated readme file

git-svn-id: https://plugins.svn.wordpress.org/client-proof-visual-editor/trunk@945197 b8457f37-d9ea-0310-8a92-e5e31aec5664