added script for fitting and eval model and updated dockerfile

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# train model, save model object and random search object
python scripts/fit_got_fatality_classifier.py \
 --training-data data/processed/train.csv \
--model-to results/models/

# evaluate model on test data and save results
python scripts/evaluate_got_fatality_predictor.py \
--test-data data/processed/test.csv \
--models-from results/models/ \
--results-to results/