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Add nsync (#292)

* Add nsync

* nsync2

* nsync3

* fix build

* update comments

* fix build option
C
Changming Sun committed
8cfe8d33a3da698e27fe1d62ad36c7b3b14cdbe6
Parent: 5742150
Committed by Raymond Yang <zihao.yang@microsoft.com> on 1/9/2019, 6:40:55 PM