Comment permalinks no longer redirecting

# Why?
We had a bug on Safari that permalinks weren't working.
Lands up there was something weird with redirection and XHR calls.

# What?
No more redirection. We load the discussion on the URL.
This is also good as redirects are slow.
This also makes semantic sense.

![No more redirection](http://stream1.gifsoup.com/view3/1331927/goin-the-wrong-way-o.gif)