strategy:futures/turtle: add priceUnit attribute.

1) Add priceUnit attribute and Adjust the methods in Futures to help
   statistic profit.
2) Adjust setAttrs() and checkAttrs() because of 1).

Signed-off-by: Zhengwang Ruan <ruan.zhengwang@gmail.com>
win: add execute mode for win.py

Add '+x' mode for win.py to make it executable.

Signed-off-by: Zhengwang Ruan <ruan.zhengwang@gmail.com>