nlohmann / json / 398

99%

develop: 99%

Pull #71

travis-ci

support enum

construct enum type to basic_json (proxy by int type)
```
    enum { t = 0 };
    json  j = json::array();
    j.push_back(t);

    j.push_back(json::object({
         {"game_type", t}
    }));
```

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