Ibreakdown

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* Description of break_down explainer added
* Description of break_down_uncertainty explainer added
* plotD3 for shap added
* chose first row when passing more than one `new_observation`

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* New version of D3 plots in `plotD3()`.
* Updated color palettes consistent with changes in DALEX 0.4.4

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* Function `local_attributions_uncertainty()` now supports `path = "average"` argument and plots shapley values ([29](https://github.com/ModelOriented/iBreakDown/issues/29)).
* Function `local_attributions_uncertainty()` is renamed to `break_down_uncertainty()`.
* Function `shap()` is an alias for `break_down_uncertainty()`.
* binder is removed as it was not used.

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* methodology behind `iBreakDown` is described on arXiv and linked in the CITATION

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* code refactoring
* added `local_attributions_uncertainty()` function that measures uncertanity behind additive attributions

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* `breakDown2` has changed name to `iBreakDown`