Remove final from DTO's to support Unit Testing #104

   import com.microsoft.azure.documentdb.*;
   import static org.assertj.core.api.Java6Assertions.assertThat;
   import static org.mockito.Matchers.*;
   import static org.mockito.Mockito.*;

...

    private void givenAResponse(List<Document> response) {
        DocumentClient documentClient = mock(DocumentClient.class);
        FeedResponse feedResponse = mock(FeedResponse.class);
        QueryIterable queryIterable = mock(QueryIterable.class);
        when(documentClient.queryDocuments(
                eq(CONNECTION_LINK),
                any(String.class),
                any(FeedOptions.class)))
            .thenReturn(feedResponse);
        when(feedResponse.getQueryIterable()).thenReturn(queryIterable);
        when(queryIterable.toList()).thenReturn(response);
    }

  org.mockito.exceptions.base.MockitoException: 
  Cannot mock/spy class com.microsoft.azure.documentdb.FeedResponse 
  Mockito cannot mock/spy following:
    - final classes