Adding changes to support voting on comments.

Comments currently display an ugly chevron button
and will allow upvoting if the user has not currently voted.

The user can (must, not auto) upvote his own comment once upon creation.
In other words: This is an ugly POC right now.

To add (after this commit):
Ordering of comments by votes
Display vote count in comment (upper corner)? if valued.
Automatically add vote when submit own comment
Nicer display for voting button

(Duplicate of above).  Looks nicer cosmetically.