Fix rct picker crash#2

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EngsShi wants to merge 3 commits intomasterfrom

fix-RCTPicker-crash

Commits on Feb 3, 2017

RN: Export Accessibility Prop Types

yungsters
authored and
facebook-github-bot
committed
Merge remote-tracking branch 'facebook/master'
ShiHui
committed
Slide RCTPicker will crash when picker item is zero
ShiHui
committed