DESIGN - REFACTORING - MovieRentalCustomer - Issue#2 - Rent and Movie are polymorphed and Movie takes care of rent.

Conflicts:
	design/c_sharp/refactoring/MovieRentalCustomerSolution/MovieRentalCustomer/Movie.cs
	design/c_sharp/refactoring/MovieRentalCustomerSolution/MovieRentalCustomer/Program.cs
	design/c_sharp/refactoring/MovieRentalCustomerSolution/MovieRentalCustomer/Rental.cs