Add responsive styles for 'attendee details' table
Add counter_cache to authentications
Further reduce queryness on the admin dashboard
bundle update
Split authentications_count migration into 'up' and 'down'
Update dataTables to use 1.10 syntax in favor of hungarian version

See http://www.datatables.net/upgrade/1.10-convert
(aoColumnDefs -> columnDefs and friends work but are not listed)
Bootstrap 3 upgrade

* Change column classes to be all that 'col-md-n' business instead of 'spanN'
* Change modals to have some extra classes