Support PickerView height customization both for IOS and android#361

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winfredxu wants to merge 3 commits intobeefe:masterfrom

winfredxu:master

Commits on Jan 24, 2019

Support PickerView height customization, directly set height for ios and set items visible for android.
winfredxu
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add android iml file.
winfredxu
committed

Commits on Jan 25, 2019

Fix the issue for IOS set height for picker view

Yike
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Yike
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