Added preprocessing and ensembling#14
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This PR contains code for average ensembling and preprocessing.
I decided not to include greedy ensembling because it did not show any improvements against no ensembling (at least in my simple tests). Same for most of the preprocessors I tried (e.g. RobustScaler, QuantileTransformer, PowerTransformer, etc...). So more research should be done to determine which preprocessors actually improve performance.