BUG: cythonize sources for wheel build

Wheel build was not cythonizing sources, giving a compile error because
needed `numpy/random/mtrand/mtrand.c` was missing.
TST: add travis test for wheel build and install

Add travis build that builds and installs wheel, runs tests from
installed wheel.
removing call to asanyarray
Merge pull request #4684 from perimosocordiae/patch-1

BUG: argwhere is not equivalent to transpose(nonzero(...)))
BUG: mtrand binomial algorithm is different from original paper algorithm
TST: update package list for chroot build

travis boxes are again badly out of date
Merge pull request #4691 from juliantaylor/travis-fix

TST: update package list for chroot build
Updated release notes to warn users about RNG state changes
Merge pull request #4687 from wa03/randBinomFix

BUG: mtrand binomial algorithm is different from original paper algorithm
BUG, TST: Fix tests of ma.count return type.

The masked array count method was fixed to use np.intp when doing sums.
The return type is always np.intp except for count(arr, axis=None) when
arr has no mask, in which case the return type is that of ndarray.size.

The test errors were noted in #4698.
Merge pull request #4662 from matthew-brett/cythonize-for-wheels

BUG: cythonize sources for wheel build
BUG: Fix invalid value raised as error when testing on Windows.

The invalid value RuntimeWarning is raised as an error in numpy
testing, and in this case the Window build was raising the warning
for comparisons of NaNs.

Fixes the first error in #4698.
Merge pull request #4700 from charris/ignore-invalid-value-in-test

BUG: Fix invalid value raised as error when testing on Windows.
Fix for unclear array.resize() error message
Merge pull request #4705 from barentsen/patch-1

Fix for unclear resize() error message
BUG: searchsorted fails if sorter is not of type np.intp fixes #4698

The array being passed to the search function was not the one converted
to NPY_INTP, so it only worked if it was of that type to begin with.
Merge pull request #4708 from jaimefrio/sorter-bug

BUG: searchsorted fails if sorter is not of type np.intp fixes #4698
Merge pull request #4699 from charris/fix-ma.count-return-type-check

BUG, TST: Fix tests of ma.count return type.