Add support for MockMvcWebTestClient

[wilkinsona]

[eiswind]

For my use cases this works already pretty well when I set up the MockMvcWebTestClient with the filter. But I use only a small subset of RestDocs.

This is what I did:

this.client = MockMvcWebTestClient.bindTo(mockMvc).baseUrl("http://localhost")
                .filter(documentationConfiguration(restDocumentation))
                .build();