Implemented quad tree, added test project.

Game/Assets/Scripts/Model/IPositionable.cs

@@ -0,0 +1,12 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace TransportGame.Model
+{
+    public interface IPositionable
+    {
+        Vector2 Position { get; }
+    }
+}

Game/Assets/Scripts/Model/IPositionable.cs.meta

@@ -0,0 +1,12 @@
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+guid: cdecfb69b7ca68446910d0a607e934e6
+timeCreated: 1432824088
+licenseType: Free
+MonoImporter:
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
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+  assetBundleVariant: 

Game/Assets/Scripts/Model/Point.cs

@@ -1,23 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-
-namespace TransportGame.Model
-{
-    public class Point
-    {
-        public int X { get; set; }
-        public int Y { get; set; }
-
-        public Point()
-        {
-        }
-
-        public Point(int x, int y)
-        {
-            X = x;
-            Y = y;
-        }
-    }
-}