git更新错误：Can‘t update: no tracked branch
No tracked branch configured for branch master.
To make your branch track a remote branch call, for example,
git branch --set-upstream master origin/master
解决：
git branch --set-upstream master origin/master
或
git branch --track master origin/master
Can't update: no tracked branch
原文：http://www.cnblogs.com/zhengbing/p/4952428.html