Validation returns a false positive result when 'allOf' is used in response schema

When allOf is used in the schema of a response the swagger rest assured plugin produces false positive validation results.

The error occurs when a response defines a schema using allOf like in the following example:

definitions:
  Foo:
    properties:
      foo:
        type: string
    required:
    - foo
  Bar:
    properties:
      bar:
        type: string
    required:
    - bar
responses:
  FooAndBar:
    description: Object with properties foo and bar implemented with allOf
    schema:
      allOf:
      - $ref: "#/definitions/Foo"
      - $ref: "#/definitions/Bar"

If the above response definition is used the SwaggerValidationFilter will accept wrong responses, for example:

{
    "foo": "some value"
}

This behavior renders the rest assured plugin (and maybe the others too) pretty much useless as soon as responses or definitions make use of allOf, therefore I classified this bug as critical.

To give a self contained and more complete example I created a swagger file and an example test that shows this behavior. In the example test only the methods testFooAndBarWithFooBar and testFooBarWithFooBar should pass. But as the example shows the three other tests that involve a response schema with allOf pass too.

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