0.1.5
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- Added `DenseTransformer` for pipelines and grid search.


0.1.4
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- `mean_centering` function is now a Class that creates `MeanCenterer` objects
  that can be used to fit data via the `fit` method, and center data at the column
  means via the `transform` and `fit_transform` method.


0.1.3
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- Added `preprocessing` module and `mean_centering` function.


0.1.2
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- Added `matplotlib` utilities and `remove_borders` function.


0.1.1
=======

- Simplified code for ColumnSelector.