ckeditor 적용

plugin/ckeditor/CHANGES.md

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+CKEditor 4 Changelog
+====================
+
+## CKEditor 4.0
+
+The first stable release of the new CKEditor 4 code line.
+
+The CKEditor JavaScript API has been kept compatible with CKEditor 4, whenever
+possible. The list of relevant changes can be found in the [API Changes page of
+the CKEditor 4 documentation][1].
+
+[1]: http://docs.ckeditor.com/#!/guide/dev_api_changes "API Changes""