directory more forgiving

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Don't require the traversed-into-object to be a Directory.

Changed:
directory.py

Here is the diff:
Index: directory.py
===================================================================
--- directory.py	(revision 26201)
+++ directory.py	(working copy)
@@ -62,8 +62,6 @@
             raise TraversalError('directory %r has no component %r' %
                                  (self, component))
         if path:
-            if not isinstance(obj, Directory):
-                raise TraversalError('%r is not a Directory instance' % obj)
             return obj._q_traverse(path)
         elif callable(obj):
             return obj()
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