ENH: apply_along_axis accepts named arguments
BUG: check alignment of strides for byteswap

closes gh-4774
BLD: add a simple python file to build cpucaps.dll

using scons seems to fail with wine 1.6, but one only needs to run three
commands so its simpler to just put these into a script instead of
trying to debug scons.
Merge pull request #4777 from juliantaylor/byteswap-align

BUG: check alignment of strides for byteswap
Merge pull request #4781 from juliantaylor/cpucaps-build

BLD: add a simple python file to build cpucaps.dll
BUG: fix where not filling string types properly

the copyswap part of where used the input arrays descriptions to copy
into the destination so if they had a smaller size the destination was
not properly padded with zeros.
Closes gh-4778
ENH: use copyswap instead of memmove for flat assignment

improves d.flat = x performance by about 35% for basic types as the
copyswap functions have known elementsizes and these are implemented
optimally by the compiler while for the generic call the compiler needs
to call out to libc.
Merge pull request #4782 from juliantaylor/where-string-fix

BUG: fix where not filling string types properly
Merge pull request #4783 from juliantaylor/flat-assign-improve

ENH: use copyswap instead of memmove for flat assignment
BUG: Avoid double iterator deallocation in `ufunc_object.c`

In `PyUFunc_GeneralizedFunction`, whenever a call to
`NpyIter_GetIterNext` fails, `NpyIter_Deallocate` is called twice, one
right after the error check, the second in the `goto fail`. Removed
the first one.
Merge pull request #4784 from jaimefrio/iter-dealloc-gufunc

BUG: Avoid double iterator deallocation in `ufunc_object.c`
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