BUG: GH10209 fix bug where date_format in to_csv is sometimes ignored#10247

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kawochen wants to merge 2 commits intopandas-dev:masterfrom

kawochen:to_csv_date_format

Commits on Jun 2, 2015

BUG: GH10209 fix bug where date_format in to_csv is sometimes ignored
kawochen
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BUG: GH10209 added test cases for freq='d', edited whatsnew
kawochen
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