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* New names for some functions: `model_performance()`, `variable_importance()`, `variable_response()`, `outlier_detection()`, `prediction_breakdown()`. Old names are now deprecated but still working. ([12](https://github.com/pbiecek/DALEX/issues/12))
* A new dataset `apartments` - will be used in examples
* `variable_importance()` allows work on full dataset if `n_sample` is negative
* `plot_model_performance()` uses ecdf or boxplots (depending on `geom` parameter).