Adding "disableComments" column to contentStatsBean to control new comments

This will add a new column to tcontentstats table called "disableComments" that is defaulted to 0. When it's set to '1', no new comments will be allowed for that piece of content.

Also, I updated contentCommentBean.cfc to return isDeleted and isSpan to getCommentBeanByCommentID() method.