Cypclass test distutil & doctest: templates

nogil_test/cypclass_test_templates.pyx

+# mode: run
+# distutils: language=c++
+# distutils: extra_compile_args=-std=c++11
+# tag: cpp
+
 cdef cypclass SomeMemory[T, U]:
   T a
   U b
@@ -12,6 +17,13 @@ cdef cypclass SomeMemory[T, U]:
     return self.b
 
 cpdef bag():
+  """
+  >>> bag()
+  1
+  2.3
+  1
+  2.3
+  """
   cdef SomeMemory[int, double] o = SomeMemory[int, double](1, 2.3)
   cdef SomeMemory[int, int] b = new SomeMemory[int, int]()
   del b