Update Swagger UI assets to v1.1.7

The latest tagged release of Swagger-UI, version 1.1.7, includes fuller
support for models, response codes, and syntax highlighting, and
includes fixes/improvements for some image references, etc.
Add models and responseClass to SwaggerApiService

The Models property in ResourceResponse, and the ResponseClass property
in MethodOperation, allow the Swagger UI to display schemas and sample
JSON for complex request/response types. The model data is generated by
reflection on request and response DTOs and inspection of
ApiMember/Description/SwaggerAllowableValues attributes. To use this
feature, define one ApiMember attribute with ParameterType = "body" and
DataType = "<class name of your request DTO>", and mark the request DTO
class with the IReturn<ResponseDTOClassName> interface. Also, ensure
that the Swagger UI js/css/html is up to date.