Jsonmodels

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* Added support for Python 2.6, 3.2 and 3.5.

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* Added lazy loading of types.
* Added schema generation for circular models.
* Improved readability of validation error.
* Fixed structure generation for list field.

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* Fixed schema generation for primitives.

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* Fields now are descriptors.
* Empty required fields are still validated only during explicite validations.

Backward compatibility breaks
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

* Renamed _types to types in fields.
* Renamed _items_types to items_types in ListField.
* Removed data transformers.
* Renamed module `error` to `errors`.
* Removed explicit validation - validation occurs at assign time.
* Renamed `get_value_replacement` to `get_default_value`.
* Renamed modules `utils` to `utilities`.

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* Allowed validators to modify generated schema.
* Added validator for maximum value.
* Added utilities to convert regular expressions between Python and ECMA
formats.
* Added validator for regex.
* Added validator for minimum value.
* By default "validators" property of field is an empty list.

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* Fixed generation of schema for BoolField.