Added BlogBundle to manage posts
Added doctrine migrations and updated dependencies
Aded Rakefile for common tasks
Added Post model and created corresponding migration
Added base BackBundle
Created base SecurityBundle to manage auth and co
Added admin theme assets
Login OK, Started dashboard
Reorganised js assets
Admin layout ready
Blog backoffice is OK
Managed pagination in blog admin
Don't show pagination if there is only 1 page
Front blog is ready