MAINT: stats: Add note about change to scoreatpercentile in release 0.12.0.

Also make a test of scoreatpercentile on a 2D array more explicit
about the expected result.

Closes gh-3329.
Fix PEP8 W391 issues (blank line at end of file).
Fix PEP8 E712 issues (comparisons to True).
Misc PEP8 fixes.
ENH: optimize: handle NaNs in curve_fit

curve_fit now raises ValueError if input data contains NaNs.
Previously curve_fit would return nonsensical results.
BUG: Workaround for SGEMV segfault in Accelerate (OSX version 10.9)

Corrects scipy.linalg.blas.sgemv, ARPACK, SuperLU
similar to: numpy/numpy#5223
ENH: optimize: add check_finite flag to curve_fit
Merge pull request #4186 from pv/pr-4105

BUG: Workaround for SGEMV segfault in Accelerate
Merge pull request #4058 from WarrenWeckesser/maint-scoreatpercentile

DOC: stats: Add note about change to scoreatpercentile in release 0.12.0.
Merge pull request #4187 from ev-br/pr/3923_

ENH: optimize: handle NaNs in curve_fit
REL: set version to 0.16.0-dev
ENH: fitpack2: add check_finite optional argument to *Spline classes

If an input array contains nans, FITPACK silently returns all
spline coefficients as nans. Better bail out early with a
sensible error message.
Merge branch 'pr/3980' into master.

See https://github.com/scipy/scipy/pull/3980
ENH: stats: return namedtuple for describe output
MAINT: some return value name changes and style tweaks to stats.describe.

See gh-3991 for discussion of the name changes.
Merge branch 'pr/3991' into master.  Namedtuple return for stats.describe

See https://github.com/scipy/scipy/pull/3991
DOC: add stub 0.16.0 release notes
BUG: integrate: fix invalid F77 syntax in quadpack
Merge pull request #4189 from pv/invalidsyntax

BUG: integrate: fix invalid F77 syntax in quadpack
BUG: special: fix up ellip_harm build