Providing a new max_comments property to a review that limits the number of comments a review published by ReviewBot can contain in order to avoid excessive commenting to the point of slowing down loading. Using arbitrary value for now.

- manually tested against local dev server: posted a patch to review that contained a long js file (jslint.js) that had more than 30 comments, and ensured that :
1) only 30 comments by JSLint were posted (total, in the entire JSLint review)
2) a descriptive warning was shown in the body_top section of the JSLint review.