_CAPTCHA_, _EDITOR_ 선언하지 않아도 오류나지 않도록 수정

캡챠와 에디터를 plugin 디렉토리에서 extend 디렉토리로 변경

plugin/ckeditor/CHANGES.md

@@ -1,12 +0,0 @@
-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""