workshops/templatetags/breadcrumbs.py: Use logging for debugging output
workshops/templatetags/breadcrumbs.py: Use logging for debugging output

The print statement is only in Python 2 (in Python 3 it's replaced by
the print() function).  In any case, this sort of debugging
information is best handled by logging [1].

[1]: https://docs.djangoproject.com/en/1.7/topics/logging/#using-logging

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