Tornado-json

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* Fixed bug where duplicate routes would be created on existence of multiple HTTP methods.

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Route generation will now inspect method signatures in ``APIHandler`` and ``ViewHandler`` subclasses, and construct routes with URL patterns based on the signatures. URL patterns match ``[a-zA-Z0-9_]+``.

**Backwards Compatibility**: ``body`` is no longer provided by ``io_schema`` as the sole argument to HTTP methods. Any existing code using ``body`` can now use ``self.body`` to get the same object.

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* Add input_example and output_example fields
* status_code 400 on ValidationError
* Exclude delete from input validation