如何在Visual Studio 2015 RC中为ASP.NET 5 MVC 6项目设置TypeScript编译器版本？

So I'm now at my witts end with this one. As the question in the title asks, I'm trying to set the tsc version for a sample ASP.NET 5 MVC 6 project. I'm using Visual Studio 2015 RC and I want to compile TypeScript using version 1.5 Beta that was recently released. In VS 2013, this was an option page in the project properties. I thought there would be some magic project.json value I could set, but nope. If I could even turn off the compilation (version 1.4) and use a Gulp task, even that would I could count as progress.So I'm now at my witts end with this one. As th