ENH: Improve perf of str_extract
Merge pull request #5944 from unutbu/str-extract

ENH: Improve perf of str_extract
PERF: add np.max and np.min to _cython_table (GH5927)
BUG: Fixed ``to_datetime`` for array with both Tz-aware datetimes and
``NaT``s  (GH5961)
BLD: travis ensures tarball can be installed without cython
BLD: pip wheel support is stable, travis can use the provided version
Merge pull request #5966 from y-p/PR_travis_cython_check

Pr travis cython check
Merge pull request #5962 from cancan101/fix_nat_tz

BUG: Fixed to_datetime for array with both Tz-aware datetimes and NaTs
Update rolling skew & kurtosis to handle cases where they aren't defined

The rolling skewness and kurtosis in algos.pyx were modified to match
the testing logic in pandas/core/nanops.py. They now both return NaN
where they are not defined, which occurs where there are either too
few observations or where the variance is zero.

A set of tests was added to verify that Nan is returned in these cases
and that the computations continue to work correctly when the values
are defined.
Merge pull request #5760 from yieldsfalsehood/master

Update rolling skew & kurtosis to handle cases where they aren't defined
Merge pull request #5960 from dsm054/more_resample_fast_paths

PERF: add np.max and np.min to _cython_table (GH5927)
PERF: perf improvments in dtypes/ftypes methods (GH5968)