Add view for filtering publication by year.

#3215 

As part of #4885, this PR deals with the filtering by year option.

Output when using the widget to filter by year:
![selection_121](https://f.cloud.github.com/assets/4497748/1921167/2ec393f8-7df6-11e3-8666-2bb65cf4938d.png)
And when selecting a year:
![selection_123](https://f.cloud.github.com/assets/4497748/1921179/5cad3a30-7df6-11e3-9d48-d53debee0f1c.png)