[#71702552] Introduce moderators

Add a property to the user that can identify it as a moderator.
Add a rake task for making users into moderators.
[#71702552] Refactor access to user in comments

Use request to get the current logged in user.
Store current user on views as metadata instead of on the collections
creating the events.
Introduce moderator role and add moderator role to abilities.
[#72390930] Only re render on deleter change

Stop re rerendering the whole comment on every change.
Add a spec to ensure that the comment switches to a deleted comment
after being deleted.
[#72390930] Reload replies to a deleted comment

After a comment is deleted, use dom:refresh to put its replies back into
the DOM.
Merge branch 'master' into moderator_delete

Conflicts:
	app/assets/javascripts/kiwi/components/comments/comments.js.coffee
	spec/javascripts/comment_spec.js.coffee
[#72390930] Rerender replies after comment delete

Switch to using dom refresh to show replies so that after delete replies
are rendered.
[#72390930] Remove paragraph tag from marked text
Merge pull request #141 from Forekasting/moderator_delete

Moderator delete