[CartBundle] Update entities
[Cart bundle] add Form
[CartBundle] Update controllers
[CartBundle] Add Choose his type of seat
[CartBundle] Redirection From FlightBundle to CartBundle + Refactoring
[CartBundle] Adding serializable() method
[CartBundle] adding an Utilitary Class
[CartBundle] Modification of  Forms Seat and Flight to pass an hidden id
[CartBundle] Added "Add to a Cart" fonctionnality
[CartBundle] Refactoring delete implementation useless of serializable()
[CartBundle][Design] Base + footer + homepage + starting of header
[CartBundle][Design] homepage
[CartBundle] manage flight searches of type: "round-trip"
[CartBundle] Modification Seat to add Coefficient for the pricing
[FlightBundle] Modification entities for the Pricing
[FlightBundle] Test Show a price
[Pricing]