Removes multiclass fit and predictors that are removed in sklearn 0.18.
Removes multiclass fit and predictors that are removed in sklearn 0.18.

Note that these were neither documented nor tested for.
Closes #716

joshua-cogliati-inl/raven,joshua-cogliati-inl/raven,idaholab/raven,idaholab/raven,joshua-cogliati-inl/raven,joshua-cogliati-inl/raven,idaholab/raven,idaholab/raven,joshua-cogliati-inl/raven,joshua-cogliati-inl/raven,idaholab/raven,idaholab/raven,joshua-cogliati-inl/raven,idaholab/raven