Add predictions_url as a member variable.

Author: minoriinoue

openml/runs/run.py

@@ -51,6 +51,7 @@ def __init__(self, task_id, flow_id, dataset_id, setup_string=None,
         self.run_id = run_id
         self.model = model
         self.tags = tags
+        self.predictions_url = predictions_url
 
     def _generate_arff_dict(self):
         """Generates the arff dictionary for uploading predictions to the server.
@@ -436,4 +437,4 @@ def _create_setup_string(model):
     """Create a string representing the model"""
     run_environment = " ".join(_get_version_information())
     # fixme str(model) might contain (...)
-    return run_environment + " " + str(model)
+    return run_environment + " " + str(model)