added wgen sample.
added wgen sample.

tomzhang/mtools,aerrami/mtools,rueckstiess/mtools,rueckstiess/mtools,parkhyeonghwa/mtools,gormanb/mtools,tomzhang/mtools,gormanb/mtools,corymintz/mtools,devkev/mtools,aerrami/mtools,corymintz/mtools,ces0712/mtools,yaowenqiang/mtools,devkev/mtools,ces0712/mtools,yaowenqiang/mtools,parkhyeonghwa/mtools,devkev/mtools,yaowenqiang/mtools,tomzhang/mtools,aerrami/mtools,ces0712/mtools,corymintz/mtools,parkhyeonghwa/mtools,gormanb/mtools