Fixed #225 -- Grouped months in archive on blog into years

This is how it looks locally: 

![](http://cl.ly/image/340w0r2n0k05/Screen%20Shot%202014-12-18%20at%2022.08.29.png)
Seems like using the `order` parameter would work here better: https://docs.djangoproject.com/en/dev/ref/models/querysets/#django.db.models.query.QuerySet.dates