Support generic class in responseClass

If ```@ApiOperation.responseClass="foo.bar.A<foo.bar.B,foo.bar.C>"```, class ```A```, ```B```, and ```C``` will be added in doc.models in listing response, and the operation's ```responseClass``` will be rewrite as ```A<B,C>```.
```B```, and ```C``` will be added in doc.models in listing response, and the operation's ```responseClass``` will be rewrite as ```A<B,C>```