adding codemirror-for-post-editor by felipelavinz

git-svn-id: http://plugins.svn.wordpress.org/codemirror-for-post-editor/trunk@677845 b8457f37-d9ea-0310-8a92-e5e31aec5664
Merge branch 'master' of github.com:felipelavinz/codemirror-for-post-editor
changed plugin path for consistency with wordpress plugin repository