Minor features/fixes

* Fix admin sub menus
* Show email address in people#index
* Add User Area link in navbar
* Smaller textareas on proposal#new so you don't have to scroll
* Counting of registrations, users and people
* Use datatables for users and people
* Show event type on admin/events#show
* Count events and use datatables, put all tables into wells
* Fix confirming of proposals
* Make it possible to uncancel events
* fix PDF generation