IA Pages Index - add count next to filter options

@russellholt @jagtalon The count gets refreshed each time a new option is selected and/or a new query is submitted.
![screen shot 2014-12-04 at 17 53 17](https://cloud.githubusercontent.com/assets/3652195/5475070/36e29c04-8616-11e4-9fca-c167104078e0.png)