Implemented Factory for Command objects and fixed Command Pattern implementation.

- Commands now have standard 0-parameter execute method
- Commands are created by CommandFactory

#story[1094]

racevisionGame/src/main/java/mock/model/commandFactory/TackGybeCommand.java

@@ -2,17 +2,22 @@ package mock.model.commandFactory;
 
 import mock.model.MockBoat;
 import mock.model.MockRace;
-import mock.model.VMG;
-import shared.model.Bearing;
 
 /**
  * Created by David on 2/08/2017.
  */
-public class TackGybeCommand implements CommandFactory {
+public class TackGybeCommand implements Command {
+    private MockRace race;
+    private MockBoat boat;
+
+    public TackGybeCommand(MockRace race, MockBoat boat) {
+        this.race = race;
+        this.boat = boat;
+    }
 
     //The refactoring of MockRace will require changes to be made
     @Override
-    public void runCommand(MockBoat boat, MockRace race) {
+    public void execute() {
         /*VMG newVMG = boat.getPolars().calculateVMG(
                 race.getWindDirection(),
                 race.getWindSpeed(),