ENH: apply_along_axis accepts named arguments
PEP8 nitpicks
BUG: Correct behavior for lists of tuples in unique, closes #4785

np.unique produces wrong results when passed a list of tuples and
no keyword arguments, as it fails to recognize it as a multidim
array, but handles it as a 1D array of objects. The only way around
this seems to be to completely eliminate the fast path for non-array
inputs using `set`.
MAINT: improve readablility of cross and improve test coverage
BUG: improve log2 windows compiler fallback of log2

Fallback (similar to python3.4 math.log2) provides int(log(2**i)) == i
in default rounding mode.
Non-default rounding modes not tested but if it does not work we are at
least not worse than python.
Closes gh-4787
Merge pull request #4788 from jaimefrio/unique_nonarray

BUG: Correct behavior for lists of tuples in unique, closes #4785
Merge pull request #4790 from juliantaylor/log2-windows

BUG: improve log2 windows compiler fallback of log2
Merge pull request #4786 from juliantaylor/cross-style

MAINT: improve readablility of cross and improve test coverage
DOC: add some highlights to release notes and reorganize

also minor general documentation fixes
[ci skip]
Merge pull request #4789 from juliantaylor/release-notes-19b1

DOC: add some highlights to release notes
BUG: Fixed piecewise function for 0d input

When `x` has more than one element the condlist `[True, False]`
is being made equivalent to `[[True, False]]`, which is correct.
However, when `x` is zero dimensional the expected condlist is
`[[True], [False]]`: this commit addresses the issue. Besides,
the documentation stated that there could be undefined values
but actually these are 0 by default: using `nan` would be desirable,
but for the moment the docs were corrected. Closes #331.
BLD: compute sha256 sums of build artifacts

Using a secure hash allows verifying ther binaries from a gpg signed
README.txt.
MD5 just kept for legacy users who may not be able to obtain a sha256
utility.
Merge pull request #4792 from Juanlu001/piecewise-fix

Piecewise fix for 0d
Merge pull request #4793 from juliantaylor/sha256-sums

BLD: compute sha256 sums of build artifacts
Merge pull request #4454 from jurnix/namedargs

ENH: apply_along_axis accepts named arguments
BLD: workaround msvc being stupid

Apparently it tries to respect calling conventions for static inline
functions so the 4th variable can't be passed over the stack as it needs
16 byte alignment.
Work around this by passing the variable as a pointer.
Closes gh-4795
Merge pull request #4796 from juliantaylor/msvc-fix

BLD: workaround msvc being stupid
DOC: document broadcastable lam parameter of poisson

closes gh-4526
DOC: fix signature of PyArray_NewShape in C-API docs

closes gh-4579
DOC: remove wrong mention of .gz in np.load

closes gh-312