dont truncate at all

Fix permalinks take two: 

In this incarnation - don't do any truncation at all if we are permalinking to a comment. 

www.theguardian.com/commentisfree/2014/oct/07/why-supermarkets-are-on-the-way-out-aldi-lidl#comment-41935830

As implemented here: 

![permalink](https://cloud.githubusercontent.com/assets/986155/4591755/91c1e042-5071-11e4-90df-e8c2ad02c5e9.png)