Added WindCommand and multiple command execution to RaceLogic

- Dispatch commands with CompositeCommand
- Single WindCommand handles upwind and downwind logic
- Changed key bindings as Mac lacks PgUp PgDn
- ControllerServer is observable, RaceLogic updates CompositeCommand as observer

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

@@ -19,6 +19,8 @@ public class CommandFactory {
         switch(action) {
             case AUTO_PILOT: return new VMGCommand(race, boat);
             case TACK_GYBE: return new TackGybeCommand(race, boat);
+            case UPWIND: return new WindCommand(race, boat, true);
+            case DOWNWIND: return new WindCommand(race, boat, false);
             default: return null; // TODO - please please have discussion over what to default to
         }
     }

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

@@ -0,0 +1,23 @@
+package mock.model.commandFactory;
+
+import java.util.Stack;
+
+/**
+ * Wraps multiple commands into a composite to execute queued commands during a frame.
+ */
+public class CompositeCommand implements Command {
+    private Stack<Command> commands;
+
+    public CompositeCommand() {
+        this.commands = new Stack<>();
+    }
+
+    public void addCommand(Command command) {
+        commands.push(command);
+    }
+
+    @Override
+    public void execute() {
+        while(!commands.isEmpty()) commands.pop().execute();
+    }
+}

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

@@ -0,0 +1,30 @@
+package mock.model.commandFactory;
+
+import mock.model.MockBoat;
+import mock.model.MockRace;
+import shared.model.Bearing;
+
+/**
+ * Created by connortaylorbrown on 4/08/17.
+ */
+public class WindCommand implements Command {
+    private MockRace race;
+    private MockBoat boat;
+    private int direction;
+
+    public WindCommand(MockRace race, MockBoat boat, boolean upwind) {
+        this.race = race;
+        this.boat = boat;
+        this.direction = upwind? 1 : -1;
+    }
+
+    @Override
+    public void execute() {
+        double wind = race.getWindDirection().degrees();
+        double heading = boat.getBearing().degrees();
+
+        double offset = 3;
+        if(wind - heading < 0) offset *= -1 * direction;
+        boat.setBearing(Bearing.fromDegrees(heading + offset));
+    }
+}