Rename helper function to communiate intent.

Per: https://github.com/GoogleCloudPlatform/gcloud-python/pull/654/files#r24877935

gcloud/storage/batch.py

@@ -121,7 +121,7 @@ def finish(self):
 
         _req = self._connection._make_request
         response, content = _req('POST', url, data=payload, headers=headers)
-        self._responses = list(_crack_mime_response(response, content))
+        self._responses = list(_unpack_batch_response(response, content))
         return self._responses
 
     def __enter__(self):
@@ -138,7 +138,7 @@ def __exit__(self, exc_type, exc_val, exc_tb):
             _BATCHES.pop()
 
 
-def _crack_mime_response(response, content):
+def _unpack_batch_response(response, content):
     """Convert response, content -> [(status, reason, payload)]."""
     parser = Parser()
     faux_message = ('Content-Type: %s\nMIME-Version: 1.0\n\n%s' %
@@ -202,7 +202,7 @@ def reset(self):
 
     def finalize(self):
         """Return the deferred requests.
-        
+
         First restores the connection's ``http`` via ``reset()``.
         """
         self.reset()