CDAP-540: Ported RecommendMovieProcedure to MovieRecommendService.

Implemented the MovieRecommendService in according to the RecommendMovieProcedure.
Old implementation is still available to compatibility with current user guides.
Here you can do:

```java
@Path("/recommend/{userId}")
@GET
public void recommend(HttpServiceRequest request, HttpServiceResponder responder, @PathParam("userId") String userId) {
... 
// Continue from line ~80
}
```