Work around mpl 1.2.1 regression re bar log plot GH3298, GH3254#3300

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Apr 9, 2013

Commits on Apr 9, 2013

Revert "Revert "TST: Log scale on bar chart hides bars GH3247" mpl 1.2.1 regression"
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BUG: work around mpl 1.2.1 regression, bar(log=True,bottom=None)) GH3254
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BUG: work around mpl 1.2.1 regression, ax.axhline(0) with log=true GH3298
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