Use task_list gem for task lists
Task Lists can now be used in comments, and they'll render in previews.
Closes internal https://dev.gitlab.org/gitlab/gitlabhq/issues/2271
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Task Lists can now be used in comments, and they'll render in previews.
Closes internal https://dev.gitlab.org/gitlab/gitlabhq/issues/2271