BUG/CLN: LinePlot uses incorrect xlim when secondary_y=True
TST/COMPAT: numpy master compat with timedelta type coercion
Merge pull request #7681 from jreback/numpy_issue

TST/COMPAT: numpy master compat with timedelta type coercion
TST: skip buggy test on numpy < 1.7, 3.2, on 32-bits (GH6270)
TST: skip buggy test if can't form test comparison (GH7664)
Merge pull request #7459 from sinhrks/secondary_y

BUG/CLN: LinePlot uses incorrect xlim when secondary_y=True
Merge pull request #7675 from jreback/skip_test

TST: skip buggy tests on debian (GH6270, GH7664)
WIP: select_dtypes impl