remove pd.running_*, pd.expanding_* and pd.ewm* and related code

Author: tp

doc/source/computation.rst

@@ -200,19 +200,12 @@ Window Functions
 
 .. currentmodule:: pandas.core.window
 
-.. warning::
-
-   Prior to version 0.18.0, ``pd.rolling_*``, ``pd.expanding_*``, and ``pd.ewm*`` were module level
-   functions and are now deprecated. These are replaced by using the :class:`~pandas.core.window.Rolling`, :class:`~pandas.core.window.Expanding` and :class:`~pandas.core.window.EWM`. objects and a corresponding method call.
-
-   The deprecation warning will show the new syntax, see an example :ref:`here <whatsnew_0180.window_deprecations>`
-
 For working with data, a number of windows functions are provided for
 computing common *window* or *rolling* statistics. Among these are count, sum,
 mean, median, correlation, variance, covariance, standard deviation, skewness,
 and kurtosis.
 
-Starting in version 0.18.1, the ``rolling()`` and ``expanding()``
+The ``rolling()`` and ``expanding()``
 functions can be used directly from DataFrameGroupBy objects,
 see the :ref:`groupby docs <groupby.transform.window_resample>`.
 

pandas/__init__.py

@@ -41,7 +41,6 @@
 
 from pandas.core.api import *
 from pandas.core.sparse.api import *
-from pandas.stats.api import *
 from pandas.tseries.api import *
 from pandas.core.computation.api import *
 from pandas.core.reshape.api import *