MAINT: Remove debug logging about stateful transforms.

The noise outweighed the signal with logging before and after each
time the transform generator is called.

zipline/transforms/utils.py

@@ -128,7 +128,6 @@ class StatefulTransform(object):
         # IMPORTANT: Messages may contain pointers that are shared with
         # other streams.  Transforms that modify their input
         # messages should only manipulate copies.
-        log.debug('Running StatefulTransform [%s]' % self.get_hash())
         for message in stream_in:
             # we only handle TRADE events.
             if (hasattr(message, 'type')
@@ -150,8 +149,6 @@ class StatefulTransform(object):
             out_message[self.namestring] = tnfm_value
             yield out_message
 
-        log.debug('Finished StatefulTransform [%s]' % self.get_hash())
-
 
 class EventWindow(object):
     """