Pixel/Object Classification: Updated for lazyflow API change in ParallelVigraRfLazyflowClassifier.
See ilastik/lazyflow@4d7e08ed0c861ba18e994a8e8169c3efc4eae098 and ilastik/ilastik#1022
PixelClassification: Serializer: Deserialization of the ClassifierFactory now checks for version compatibility.
See recent lazyflow change: ilastik/lazyflow@bcd0fec61ae231c802e45d48381b304350d1edb2