Add C++ nested class example

This also reverts the nested class additions to the Java/C# 'class' example
so that the 'class' example remains identical across different language modules

Examples/java/class/example.h

@@ -2,19 +2,17 @@
 
 class Shape {
 public:
-  struct Counter{
-		static int nshapes;
-  };
   Shape() {
-    Counter::nshapes++;
+    nshapes++;
   }
   virtual ~Shape() {
-    Counter::nshapes--;
+    nshapes--;
   };
   double  x, y;   
   void    move(double dx, double dy);
   virtual double area(void) = 0;
   virtual double perimeter(void) = 0;
+  static  int nshapes;
 };
 
 class Circle : public Shape {