Updated packages
Make sure a subscription is valid before the confirm and finish actions are processed
Refactored some functionality to 'manager' classes.
Make a difference between updating an existing and saving a new Subscription
Added menu for backend
Added menu for backend
Added backend controller placeholders
Update menu configuration
Added backend base view
Added form and validation for adding a new Subscription
Added home link to backend menu
Updated view of subscription grid a little more, also added pagination.
Added all details to view/confirm page
Implemented backend subscription functionality