fix logging when RevisionDelete delete log etc.

Changes:
* Fix mistakes of logging when RevisionDelete delete log
* Split up RevisionCommentSupplement.body.php
  into RevisionCommentSupplement.class.php
  and RevisionCommentSupplement.hook.php
* Update README
* Change messages
* Modify special page aliases

Change-Id: If54b7d02960fc22b7a0a0abd7c92a5d26d802f72