Moved Invoice entity and form to InvoiceBundle
Payment Bundle : created FlightSeat entity and Invoice update
Moved payment images and views to PaymentBundle

+ bih-header moved to mainBundle (and assetic management with absolute path)
Renamed FlightSeats to SeatBooking
Added price attribute to Flight and various payment process modifications
Payment process test and bug corrections
FlyerBundle update
Added a private and public part to Passports
Merge branch 'paymentBundle' into dev