Osra282 implement pagination

Finished this sub-task for pagination & Display the number of pages total.
 https://osraav.atlassian.net/browse/OSRA-282

Craig, I had to update kaminari.rb in order for will_paginate gem to work. The 2 are interdependent within Active Admin. So I added kaminari into the gemfile.
http://activeadmin.info/docs/0-installation.html  at bottom of page.
"If you use will_paginate in your app, you need to configure an initializer for Kaminari to avoid conflicts. "