Generate models from json-schema

[smileatom]

Generating models from json data is kind of pointless. Generate from json-schema instead.

[tomquist]

The main purpose of this tool is to infer a data model when there is no specification or schema which unfortunately is often the case in real-world projects. However, there is already work in progress to import swagger specifications which basically uses json-schema but it has some limitations. Once this is finished, it should be easy to create an importer for json-schema. Feel free to open a pull request.