Merge branch 'comment-and-close' into 'master'

@dzaporozhets I had the same feature in my pipe, but decided not submit because I couldn't get the testcases running :(. Javascript wasn't submitting the note in the testcase:( Code is here: https://github.com/Razer6/gitlabhq/compare/feature/close_and_comment

@razer6 future advise - submit wip MR and ask community for help. People may help you or use your code to submit better solution

@dzaporozhets will do. by the way, I start with playing with html-pipeline. Would you accept a switch? I think it would make things easier to maintain such is task lists :)