解决ASP.NET Core VS2015 没有“新搭建基架的项目” no New Scaffolded Item

安装以下包：

"Microsoft.VisualStudio.Web.CodeGenerators.Mvc": "1.0.0-preview2-update1",
"Microsoft.VisualStudio.Web.CodeGeneration.Core": "1.0.0-preview2-update1",
"Microsoft.VisualStudio.Web.CodeGeneration.EntityFrameworkCore": "1.0.0-preview2-update1",
"Microsoft.VisualStudio.Web.CodeGeneration.Templating": "1.0.0-preview2-update1",
"Microsoft.VisualStudio.Web.CodeGeneration.Tools": "1.0.0-preview2-update1"