Added session voiding, article 'liking' with count, completed account creation

'sessions' table now UTF-8 (not convinced it's necessary)
Added support for session voiding
Added article 'liking', along with 'like' count
Fixed issues with route controller names
'All items' is now 'Subscriptions'
Moved paging controller's logic into ArticlesController
Completed new account creation; admins can now be created without OpenId