TST: test for breaking test in pytables on travis
CLN/BUG: Revert 2/3 compat changes to vb_suite
Merge pull request #4478 from jtratner/revert-vb-suite

BUG: revert 2/3 changes in vbsuite
Merge pull request #4489 from jreback/hdf_fix

TST: test for breaking test in pytables on travis
TST: reverse hdf_fix
Merge pull request #4490 from jreback/hdf_fix2

TST: reverse hdf_fix
BLD/TST: correct pytz version for tox
BUG: fix plotting of dup indexed objects
Merge pull request #4495 from Komnomnomnom/tox-pytz

BLD/TST: correct pytz version for tox
Merge pull request #4492 from cpcloud/plotting-length-fix

BUG: fix plotting of dup indexed objects
ENH/BUG: ignore line comments in CSV files GH2685

* also fix bug in CSV format sniffer