bigmlcom/closchema — pull request #25 by nlacasse (2013-03-20 20:48:35+00:00)
Title: Replaced "optional" attribute with "required" attribute.

As of draft-zyp-json-schema-03 the ``optional`` keyword has been removed in favor of a ``required`` keyword.

5.7. required
This attribute indicates if the instance must have a value, and not
be undefined. This is false by default, making the instance
optional.

http://tools.ietf.org/html/draft-zyp-json-schema-03#section-5.7

This pull request replaces the checks for ``(:optional schema)`` with checks for ``(not (:required schema))``. It also fixes the tests accordingly