Changed how indexing works when hn[id] is called

The site has the indexing done so it starts from 1, and not 0. This makes quoting the actual Hacker News post a hassle because you have to always substract 1 to get the actual article link and title.

Eg.
![](http://puu.sh/80KIM/f3f05fd313.png)

And we before had to call the script using `hn[0]` to get the following response:

> EU top court rules EU data retention law invalid: http://www.reuters.com/article/2014/04/08/us-eu-data-ruling-idUSBREA370F020140408 (https://news.ycombinator.com/item?id=7552087)