apply SF Patch #350 and add testcase

Examples/test-suite/director_nestedmodule.i

@@ -0,0 +1,29 @@
+%module(directors="1") "director::nestedmodule"
+
+%{
+#include <string>
+
+class Foo {
+  public:
+    virtual ~Foo() {}
+    virtual std::string ping() { return "Foo::ping()"; }
+    virtual std::string pong() { return "Foo::pong();" + ping(); }
+
+    static Foo* get_self(Foo *slf) {return slf;}
+};
+
+%}
+
+%include <std_string.i>
+
+%feature("director") Foo;
+
+
+class Foo {
+  public:
+    virtual ~Foo();
+    virtual std::string ping();
+    virtual std::string pong();
+
+    static Foo* get_self(Foo *slf);
+};