DAR-120 comments_index entries should be created within the main article transaction
DAR-120 code comments
DAR-120 storing db connection as a CommentsIndex object attr
DAR-120 adding CommentsIndex cache, fixing few errors
DAR-120 removing test code
DAR-120 marking wall-related changes in MW code
DAR-120 removing test code
DAR-120 code comments
DAR-120 CommentsIndex cache unit test
DAR-120 code review fixes
Merge pull request #1605 from Wikia/DAR-120

Dar 120 - wall empty bug fix