Enum Department added.
Consists of:
- POLICE
- FIREFIGHTERS
- AIRFORCE
Class Unit added.
Consists of:
- department : Department (Police, firefighers, or airforce)
- type : String (For example: SWAT car, bike)
- location : Point
- available : Boolean
Class Unit edited.
New:
- id :String (For example: A car's license plate or a bike serial number)
- employees : List<Employee> (A list of all employees in, or a part of, a vehicle)

- addEmployee(Employee employee) : An employee gets added to the unit
- removeEmployee(Employee employee) : An employee gets removed from the unit
Enum Gender created
This enum consists of:
- MALE
- FEMALE
Class Employee created
This class consists of:
- id : int (An unique identifier for an employee)
- surname : String
- lastname : String
- address : String
- gender : Gender

- All getters and setter that may be needed later on are added
- A method is created to get the full name of an employee
  (For example: A male with surname "Steve" and lastname "Jobs" gives the following output: "Mr. Steve Jobs")
Merge branch 'master' of https://github.com/Bonemind/ProftaakMW.git