Added Page Limit to Pagination

Added "hidden" class to core.css file.

Added ability to limit the amount of pages displayed in the navigation
bar. The default has been set to 2 greater than and lesser than the
current page.

Preview: at initialization
![pager1](https://f.cloud.github.com/assets/5826393/1457040/0f9096fa-4338-11e3-89b7-f0018175a051.jpg)


Preview: paging further from beginning
![pager2](https://f.cloud.github.com/assets/5826393/1457041/133a4fee-4338-11e3-845f-15051edc1a3b.jpg)