Adding 2 more properties

I have added properties for the other 2 vertexes of the Rectangle, the upperRight and the lowerLeft vertexes.

color.d

@@ -1481,12 +1481,26 @@ struct Rectangle {
 	}
 
     ///
-	@property Point upperLeft() {
+    @property Point upperLeft()
+    {
         return Point(left, top);
     }
 
     ///
-	@property Point lowerRight() {
+    @property Point upperRight()
+    {
+        return Point(right, top);
+    }
+
+    ///
+    @property Point lowerLeft()
+    {
+        return Point(left, bottom);
+    }
+
+    ///
+    @property Point lowerRight()
+    {
         return Point(right, bottom);
     }