rebase和merge的正确使用时机
https://medium.com/@porteneuve/getting-solid-at-git-rebase-vs-merge-4fa1a48c53aa
git的subtree的用法
https://medium.com/@porteneuve/mastering-git-subtrees-943d29a798ec
https://medium.com/@dashersw/how-to-manage-git-workflow-and-stay-sane-e32405e9dbf0