Implemented 4th Milestone, Finished Product

CCity.Model.Test/CitizenTest.cs

CCity.Model.Test/DecreasePopulationTest.cs

CCity.Model.Test/EffectSpreadTest.cs

CCity.Model.Test/ElectricitySpreadTest.cs

CCity.Model.Test/FireTest.cs

CCity.Model.Test/ForestTest.cs

CCity.Model.Test/IncreasePopulationTest.cs

CCity.Model.Test/LevelBuilder.cs

CCity.Model.Test/LogbookTest.cs

CCity.Model.Test/PlaceDemolishTest.cs

CCity.Model.Test/PublicitySpreadTest.cs

CCity.Model.Test/SatisfactionTest.cs

CCity.Model.Test/TaxTest.cs

CCity.Model.Test/UpgradeTest.cs

CCity.Model/Citizen.cs

CCity.Model/CitizenManager.cs

CCity.Model/CommercialZone.cs

CCity.Model/FieldManager.cs

CCity.Model/FireDepartment.cs

CCity.Model/FireManager.cs