Add delete function in editor and mass-edit

git-svn-id: https://plugins.svn.wordpress.org/gwolle-gb/trunk@1044121 b8457f37-d9ea-0310-8a92-e5e31aec5664
Update Readme

git-svn-id: https://plugins.svn.wordpress.org/gwolle-gb/trunk@1044124 b8457f37-d9ea-0310-8a92-e5e31aec5664