BUG 12800 fixed inconsistent behavior of last_valid_index and first_valid_index#12834

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gregorylivschitz wants to merge 2 commits intopandas-dev:masterfrom

gregorylivschitz:inconsistent_series_frames_bug

Commits on Apr 9, 2016

BUG 12800 fixed inconsistent behavior of last_valid_index
gregorylivschitz
committed
BUG 12800 added whatsnew note and comments for tests
gregorylivschitz
committed