additional common.is_*_dtype tests in core.common
make better use of dtype tests in nanops
Merge pull request #7564 from dstephens99/master

TST: Remove else after except in tests for io.data.Options.
Merge pull request #7547 from toddrjen/nanopsclean

Minor cleanups for nanops
BUG: bug in float64index assignment with a non scalar indexer
Merge pull request #7587 from cpcloud/float64index-assign-7586

BUG: bug in float64index assignment with a non scalar indexer
BUG: Bug in timedelta inference when assigning an incomplete Series (GH7592)
Merge pull request #7593 from jreback/timedelta_nat

BUG: Bug in timedelta inference when assigning an incomplete Series (GH7592)
TST: tests for GH7594, ensure conversion on tz-aware datetimes in the constructors
Merge pull request #7595 from jreback/tz_aware

TST: tests for GH7594, ensure conversion on tz-aware datetimes in the constuctors
COMPAT: comparisons vs numpy nat not working on windows
Merge pull request #7597 from pydata/nat

COMPAT: comparisons vs numpy nat not working on windows
TST: Change nose.SkipTest to raise nose.SkipTest for io.data.Options.