str'ified column names in DataFrame.to_hdf(); Fixes #9057#9902

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jameshiebert wants to merge 2 commits intopandas-dev:masterfrom

jameshiebert:bugfix-9057

Commits on Apr 14, 2015

BUG GH9057
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Commits on Apr 15, 2015

Moved test from pandas/tests/test_frame.py to pandas/io/test_pytables.py
jameshiebert
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