push代码报错：
hint: Updates were rejected because the tip of your current branch is behind
hint: its remote counterpart. Merge the remote changes (e.g. 'git pull')
hint: before pushing again.
hint: See the 'Note about fast-forwards' in 'git push --help' for details.
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有如下几种解决方法：
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1.使用强制push的方法：
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$ git push -u origin master -f
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这样会使远程修改丢失，一般是不可取的，尤其是多人协作开发的时候。
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2.push前先将远程repository修改pull下来
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//$ git pull origin master
$ git pull --rebase origin master
$ git push -u origin master
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3.若不想merge远程和本地修改，可以先创建新的分支：
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$ git branch [name]
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然后push
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$ git push -u origin [name]
