Issue python#112: Prepare Stackless 3.5, fix pickling tests

-  Fix the CPython test case test.test_pickle.CompatPickleTests.test_exceptions

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

Author: Anselm Kruis

Lib/_compat_pickle.py

@@ -141,6 +141,13 @@
     "ZeroDivisionError",
 )
 
+try:
+    import stackless
+except ImportError:
+    pass
+else:
+    PYTHON2_EXCEPTIONS = PYTHON2_EXCEPTIONS + ("TaskletExit",)
+
 for excname in PYTHON2_EXCEPTIONS:
     NAME_MAPPING[("exceptions", excname)] = ("builtins", excname)