Djcroco

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* Add tests.
* Major Django/Python versions supported.
* Add support for downloading the thumbnail and text of document.
* Bug fixes.

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* Fix issue when file has not changed while saving model.
* Return doc name as a string repr of class.
* Add `content_url` property.
* Provide urls to view/download the document. It is a little performance fix
as it means that it does not need to create new session on Crocodoc every time
template gets refreshed/rendered.
* Property `view_file` changed to more appropriate `url`.

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* Fix import of South introspection module.

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* djcroco is a model field now (and its old API is backward incompatible).

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* Fix issue when `url` of thumbnail was not returned properly.
* Allow to use custom width/height of the thumbnail.

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* Allow to use env variables for config.
* Bug fixes.