Spray lift-json support

spray_lift_json

implicit def liftJsonUnmarshaller[A :Manifest] = new UnmarshallerBase[A] {
           val canUnmarshalFrom = ContentTypeRange(`application/json`) :: Nil
           def unmarshal(content: HttpContent) = protect {
                   val jsonSource = DefaultUnmarshallers.StringUnmarshaller.unmarshal(content).right.get
                   parse(jsonSource).extract[A]
           }
   }

   implicit def liftJsonMarshaller[A <: AnyRef] = new MarshallerBase[A] {
           val canMarshalTo = ContentType(`application/json`) :: Nil
           def marshal(value: A, contentType: ContentType) = {
                   val jsonSource = write(value)
                   DefaultMarshallers.StringMarshaller.marshal(jsonSource, contentType)
           }
   }