Update Dockerfile for Visual Studio 2015 CTP 5 projects

[KentaroAOKI]

Hi,

I update Dockerfile for Visual Studio 2015 CTP 5 and I was able to run following asp.net 5 project on updated docker image.

https://github.com/KentaroAOKI/Aspnet5WebApplicationForDocker

Thanks.

Kentaro

[ahmetb]

@KentaroAOKI thanks. This is almost the same thing as #28 as it installs git, grunt, node. Let's continue the discussion over there.

[KentaroAOKI]

@ahmetalpbalkan Thanks.

[ghost]

Hi @KentaroAOKI, I'm your friendly neighborhood Microsoft Open Technologies, Inc. Pull Request Bot (You can call me MSOTBOT). Thanks for your contribution!

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[ahmetb]

Duplicate of #28.