DOC: remove an obsolete file
ENH sparse:  Add support for sparse matrix .min and .max axis arguments.
TST sparse: Tests for sparse matirx min and max axis args.
MAINT: remove leftover check for Python <= 2.5.  Some cleanups of comments.
DOC: enhance interp2d docstring, see #2275
Merge pull request #2783 from rgommers/cleanup

MAINT: remove leftover check for Python <= 2.5.  Some cleanups of comments
DOC: enhance splrep docstring, see #2223
Merge pull request #2785 from andreas-h/interpolate_doc2

DOC: interpolate: enhance interp2d docstring, see #2275
ENH interpolate: remove warnings in pchip

Division by zero occurs only at points excluded in the
following calculations, so warning messages can be removed
safely

Closes gh-2357
Merge pull request #2769 from cowlicks/min-max-axis-args

ENH: sparse: matrix min & max axis arguments.
Merge pull request #2786 from loujine/fix-2357

ENH: interpolate: remove warnings in pchip
DOC: add cython dependency to INSTALL
Merge pull request #2799 from andreas-h/INSTALL_cython

DOC: add cython dependency to INSTALL
DOC: make more clear when Cython is required.
Merge pull request #2766 from argriffing/remove-obsolete-docs

DOC: remove doc/seps/technology-preview.rst