Merge branch '134-original-file-names-in-downloaded-prediction-json' into 'master'

Resolve "original file names in downloaded prediction json"

Closes #134

See merge request troebs/pycs!122

pycs/interfaces/MediaFile.py

@@ -124,6 +124,7 @@ class MediaFile:
             'frames': self.frames,
             'fps': self.fps,
             'path': self.path,
+            'filename': self.__file.name + self.__file.extension,
             'results': list(map(lambda r: r.serialize(), self.results())),
             'predictions': list(map(lambda r: r.serialize(), self.predictions())),
         }