Failed to initialize the PowerShell host 更简单的解决方案
在使用VS NuGet添加引用时，出现如下信息：
Install failed. Rolling back… Failed to initialize the PowerShell host. If your PowerShell execution policy setting is set to AllSigned, open the Package Manager Console to initialize the host first.
按照http://blog.csdn.net/feng005211/article/details/47293265的指引，找到了适合我的更简单的办法。
进入注册表HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\PowerShell，将ExecutionPolicy的值设为空即可
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