Added Enums for each Open View for easier storage for Session.

src/main/java/seng202/group9/Controller/Session.java

@@ -6,7 +6,16 @@ import java.io.Serializable;
  * Created by fwy13 on 16/09/16.
  */
 public class Session implements Serializable {
-    private SceneCode sceneDisplayed = SceneCode.INITIAL;
+    private SceneCode sceneDisplayed;
+
+    public Session(){
+        //blank constructor
+        this.sceneDisplayed = SceneCode.INITIAL;
+    }
+
+    public Session(SceneCode scene){
+        this.sceneDisplayed = scene;
+    }
 
     public void setSceneDisplayed(SceneCode sceneDisplayed) {
         this.sceneDisplayed = sceneDisplayed;