Merge branch 'master' into non-interactive-aws-install

Conflicts:
	doc/installation.md

Fix merge mess in installation.md

Didn't bother with files in db/, config/, or features/

Update method to take ids and then perform #finds itself during mailer
queue worker kick-off.

Update method to take ids and then perform #finds itself during mailer
queue worker kick-off. Also, the faux SHA1 cannot have underscores or
it will not match the commit pattern defined in the routes.

Update method to take ids and then perform #finds itself during mailer
queue worker kick-off.

Update method to take ids and then perform #finds itself during mailer
queue worker kick-off.

#changed_merge_request_email was really sending emails about merge
request reassignments. Updated method name to reflect that.

Update method to take ids and then perform #finds itself during mailer
queue worker kick-off.

#changed_issue_email was really sending emails about issue reassignments.
Updated method name to reflect that.

Update method to take ids and then perform #finds itself during mailer
queue worker kick-off.

Allows to alert only the commit author when a new note is added on a commit, useful when gitlabhq is used for code
reviews, allows less noise with mails...