title: spring-restdocs is not recognizing apply()
body: <p>I am trying to generate a Rest API documentation based on <a href="http://docs.spring.io/spring-restdocs/docs/current/reference/html5/#getting-started-documentation-snippets-setup" rel="nofollow">spring-restdocs</a></p>
  
  <p>In following code I am getting a compile time error at <strong>apply()</strong></p>
  
  <blockquote>
    <p>The method apply(RestDocumentationMockMvcConfigurer) is undefined for the type DefaultMockMvcBuilder</p>
  </blockquote>
  
  <pre><code>@ContextConfiguration(locations = { "classpath:/testApplicationRestService.xml" })
  @RunWith(SpringJUnit4ClassRunner.class)
  @WebAppConfiguration
  public class CustomerControllerTest {
  
      @Rule
      public final RestDocumentation restDocumentation = new RestDocumentation(
              "build/generated-snippets");
  
      @Autowired
      private WebApplicationContext context;
      private MockMvc mockMvc;
  
      @Before
      public void setUp() {
  
          this.mockMvc = MockMvcBuilders.webAppContextSetup(this.context)
                  .apply(documentationConfiguration(this.restDocumentation))
                  .build();
      }
  
  }
  </code></pre>