anchor.diff:  
               { 
                   "dataset-id": "<dataset-id>",
  -		"specification-url": "http://s3.com/mnist_solver.prototxt",
  +                "specification-url": "http://s3.com/mnist_solver.prototxt",
                   "specification-net-url": "http://s3.com/mnist_train_test.prototxt"
               }
   
  
positive.code: 
      + Body
  
  	    { 
  		"specification-url": "http://s3.com/mnist_classifier.prototxt",
  		"model-url": "http://s3.com/mnist.caffemodel",
  	    }
  
  + Response 201 (application/json)
  
  
negative.code: 
              { 
                  "training": {
                      "datafile-id": "datafile-uuid", 
                      "split-percentage": 0.7
                  },
                  "testing": {
              "datafile-id": "datafile-uuid", 
                      "split-percentage": 0.3
                  }
              }
  