add OrderedDict to util

edbob/util.py

@@ -31,6 +31,13 @@ from pkg_resources import iter_entry_points
 import edbob
 
 
+# Import OrderedDict for the sake of other modules.
+try:
+    from collections import OrderedDict
+except ImportError:
+    from ordereddict import OrderedDict
+
+
 def entry_point_map(key):
     """
     Convenience function to retrieve a dictionary of entry points, keyed by