Clean up construction of Series with dictionary and datetime index#14895

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nateyoder wants to merge 2 commits intopandas-dev:masterfrom

nateyoder:series_dict_index

Commits on Dec 16, 2016

Fix usage of fast_multiget with index which was always throwing an exception that was then caught; add ASV that show slight improvement
nateyoder
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Update whatsnew and fix pep8 issue
nateyoder
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