Utilize ParameterizedTypeReference in REST client

Currently for parameterized response types, we generate the following:

@Get("/")
List<Lesson> getLessons();

restTemplate.exchange(rootUrl, HttpMethod.GET, null, List_Lesson.class).getBody();

// ...

public class List_Lesson extends ArrayList<Lesson> {

}

This was a clever solution, but unnecessary since Spring for Android 2.0, which has built-in support for parameterized response types:

restTemplate.exchange(rootUrl, HttpMethod.GET, null,
new ParameterizedTypeReference<List<Lesson>>() { }).getBody();

I think we should use it it available.

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