Merge branch 'pr/3415' into master.

Review at https://github.com/scipy/scipy/pull/3415
REL: set version to 0.15.0-dev, add 0.15.0 release notes.
BUG: tools: Fix list of FMA instructions in detect_cpu_extensions_wine.py
DOC: stats: Add 'entropy' to the stats package-level documentation.
Merge pull request #3420 from WarrenWeckesser/doc-stats-entropy

DOC: stats: Add 'entropy' to the stats package-level documentation.
Merge pull request #3419 from WarrenWeckesser/fix-fma-instructions

BUG: tools: Fix list of FMA instructions in detect_cpu_extensions_wine.py
Added 'eps' in optimize.show_options for L-BFGS-B

In scipy.optimize.minimize, when algorithm is L-BFGS-B, there is an
option called eps. However, this options is missing if we use
scipy.optimize.show_options('minimize', 'L-BFGS-B') to look up its
options.
Merge pull request #3427 from yw5aj/master

Added 'eps' in scipy.optimize.show_options for L-BFGS-B
MAINT: Add myself to thanks :)

I worked on scipy.sparse a bit last summer for GSoC.
Thanks again @pv!
Merge pull request #3428 from cowlicks/thanks

MAINT: Add myself to thanks :)
MAINT: tweak cython variables declarations to avoid the warning
'Non-trivial type declarators in shared declaration ...' that is
generated by cython 0.20.
MAINT: special: tweak the generated cython variable declarations in _ufuncs.pyx
to avoid the warning 'Non-trivial type declarators in shared declaration ...'
that is generated by cython 0.20.
GEN: special: regenerate _ufuncs.pyx
BUG: Correcting the normalization of chebwin window function
Merge pull request #3433 from ankit-maverick/chebwin

Correcting the normalization of chebwin window function
Merge pull request #3430 from WarrenWeckesser/cython-declarations

MAINT: Fix some cython variable declarations to avoid warnings with cython 0.20.
MAINT: ignore harmless whitespace errors in pep8
MAINT: enable pep8 in travis-ci
WHT: fix remaining pep8 whitespaces
Merge pull request #3396 from juliantaylor/nanmedian-improve2

ENH: improve stats.nanmedian more by assuming nans are rare