attr_dict class is now pickable

nabirds/utils/__init__.py

@@ -47,6 +47,11 @@ class attr_dict(dict):
 			return attr_dict(res)
 		return res
 
+	def __getstate__(self): return self.__dict__
+
+	def __setstate__(self, d): self.__dict__.update(d)
+
+
 class _MetaInfo(object):
 	def __init__(self, **kwargs):
 		for name, value in kwargs.items():