Merge remote-tracking branch 'upstream/master' into ordinal-encoder-support-new-handle-unknown-handle-missing

Author: JohnnyC08

CONTRIBUTING.md

@@ -31,7 +31,7 @@ The preferred workflow to contribute to git-pandas is:
 Guidelines
 ==========
 
-Git-pandas is still a very young project, but we do have a few guiding principles:
+This is still a very young project, but we do have a few guiding principles:
 
  1. Maintain semantics of the scikit-learn API
  2. Write detailed docstrings in numpy format
@@ -46,7 +46,9 @@ To run the tests, use:
     $ nosetests --with-coverage
     $ coverage html
 
+Run the tests with both, Python3 and Python2.   
+    
 Easy Issues / Getting Started
 =============================
 
-There are usually some issues in the project github page looking for contributors, if not you're welcome to propose some ideas there, or a great first step is often to just use the library, and add to the examples directory.  This helps us with documentation, and often helps to find things that would make the library better to use.
+There are usually some issues in the project github page looking for contributors, if not you're welcome to propose some ideas there, or a great first step is often to just use the library, and add to the examples directory. This helps us with documentation, and often helps to find things that would make the library better to use.

category_encoders/basen.py

@@ -3,7 +3,6 @@
 import pandas as pd
 import numpy as np
 import math
-import warnings
 from sklearn.base import BaseEstimator, TransformerMixin
 from category_encoders.ordinal import OrdinalEncoder
 import category_encoders.utils as util
@@ -255,7 +254,6 @@ def inverse_transform(self, X_in):
 
         """
 
-        warnings.warn('Inverse transform in basen is a currently experimental feature, please be careful')
         X = X_in.copy(deep=True)
 
         # first check the type