amend test to run on py2.7 and numpy 1.9.2

Author: watercrossing

pandas/tests/indexes/datetimes/test_partial_slicing.py

@@ -334,7 +334,7 @@ def test_loc_datetime_length_one(self):
 
     @pytest.mark.parametrize('datetimelike', [
         Timestamp('20130101'), datetime(2013, 1, 1),
-        date(2013, 1, 1), np.datetime64('2013-01-01', 'ns')])
+        date(2013, 1, 1), np.datetime64('2013-01-01T00:00', 'ns')])
     @pytest.mark.parametrize('op,expected', [
         (op.lt, [True, False, False, False]),
         (op.le, [True, True, False, False]),