Fix all comments link for guests

The jquery selector was depending on the comment form to be there.
Logged out users don't have a comment form and therefore, clicking the
"All Comments" link resulted all comments being removed from the DOM.

The fix adds a .comments div inside .Comments-section so that there is a
proper section containing all the comments.

https://github.com/BiteKollektiv/fairnopoly/issues/42
Re-render comment form after successful creation

When first entering an invalid comment and then a valid one, the error
message didn't disappear.

https://github.com/BiteKollektiv/fairnopoly/issues/44
More space between comment pagination

https://github.com/BiteKollektiv/fairnopoly/issues/41
Add link to login for guest users on comments

https://github.com/BiteKollektiv/fairnopoly/issues/43
Fix Rails Best Practices warnings
Merge pull request #964 from BiteKollektiv/fix-comments

Fix comments