Issue python#112: Prepare Stackless 3.5, enable pickling of coroutines

Skip CPython test cases for coroutine pickling / copying.

https://bitbucket.org/stackless-dev/stackless/issues/112

Author: Anselm Kruis

Lib/test/test_coroutines.py

@@ -1598,6 +1598,7 @@ async def foo():
             foo().send(None)
         self.assertEqual(result, [42])
 
+    @unittest.skipIf(support.stackless, "Stackless can copy coroutines")
     def test_copy(self):
         async def func(): pass
         coro = func()
@@ -1611,6 +1612,7 @@ async def func(): pass
         finally:
             aw.close()
 
+    @unittest.skipIf(support.stackless, "Stackless can pickle coroutines")
     def test_pickle(self):
         async def func(): pass
         coro = func()