added "ratio" parameter to $choose.
added "ratio" parameter to $choose.

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