Adds hide/show comments for all comments, fixes those links for 'load more comments' comments

There was an issue with comments loaded from 'load more comments' not having the show/hide child comment links which has been resolved.

I added show/hide comment links to all comments with children which I find is a very handy feature.

I also changed the link text. I can revert that portion, it's not a big deal, but it just felt better.

First pull request woohoo!