TinyMCE: add a custom jQuery event 'tinymce-editor-init' triggered on initialization of every editor instance. This makes it a lot more convenient to hook into the instance compared to the init.setup callback. See #24067, see #26872.

git-svn-id: https://develop.svn.wordpress.org/trunk@26983 602fd350-edb4-49c9-b593-d223f7449a82