need a whl package script to build whl on mac/ubuntu
Created by: Superjomn
currently, the WHL package is built manually, quite trivial and easy to make mistake.
Recently, much bugfix is merged, but no new WHL is updated.
We'd better have a script, to build WHL in the different environments, it seems that the Travis-CI has mac env, but not sure whether it can be used to build WHL.