Add python3.2 management.

src/jflow/workflow.py

@@ -594,7 +594,10 @@ class Workflow(threading.Thread):
         """
         odict = self.__dict__.copy()
         del odict['_started']
-        del odict['_tstate_lock']
+        if '_tstate_lock' in odict: # python 3.4
+            del odict['_tstate_lock']
+        else: # python 3.2
+            del odict['_block']
         del odict['_stderr']
         if 'external_components' in odict:
             del odict['external_components']