BLD: numpy master changes breaking
(24 hrs ago) good build: https://travis-ci.org/pydata/pandas/jobs/102356098: 1.11.0.dev0+51d2ecd
(1 hr ago) breaking lots of things: https://travis-ci.org/pydata/pandas/jobs/102596904: 1.11.0.dev0+aa6335c

@shoyer IIRC a couple of your PR's were merged in the last day.

here's an example:

```
======================================================================
FAIL: test_coercion_with_setitem_and_series (pandas.tests.test_indexing.TestSeriesNoneCoercion)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/travis/build/pydata/pandas/pandas/tests/test_indexing.py", line 5247, in test_coercion_with_setitem_and_series
    expected_series.values, strict_nan=True)
  File "/home/travis/build/pydata/pandas/pandas/util/testing.py", line 866, in assert_numpy_array_equal
    raise_assert_detail(obj, msg, left, right)
  File "/home/travis/build/pydata/pandas/pandas/util/testing.py", line 825, in raise_assert_detail
    raise AssertionError(msg)
AssertionError: numpy array are different
numpy array values are different (33.33333 %)
[left]:  [NaT, 2000-01-02T00:00:00.000000000+0000, 2000-01-03T00:00:00.000000000+0000]
[right]: [NaT, 2000-01-02T00:00:00.000000000+0000, 2000-01-03T00:00:00.000000000+0000]
```
