Implementation of factory creational design pattern

[shaynmorgan]

Major Changes

• Creation of CoordinateFactory class to implement Factory design pattern, creation_type is a parameter which determines which constructor is called, either Longitude or Latitude.
• The corresponding Coordinate type is then created
• Abstraction of Coordinate class which is a superclass to the two symmetrical classes Latitude and Longitude, for the CoordinateFactory implementation.
• Coordinates class is a composition of Latitude and Longitude.