Add template support for .NET Core 1.1

[ILMTitan]

Ivan is working on getting CloudBuilder support for .NET Core 1.1. The templates should be updated to also support that.

[ivannaranjo]

The 1.1 support is already present in the deployment side. I am going to be working on adding support for the extension.

[ivannaranjo]

The extension support for deploying ASP.NET Core 1.1 apps is being tracked on #646

[ivannaranjo]

Thinking about moving this to early Q3, do you think you can get to this in the next week?

[ILMTitan]

I do not. I have not investigated what is required.

[ivannaranjo]

Moving to Q3.

[ILMTitan]

In VS 2017, changing the framework to .NET Core 1.1 is a simple matter of going to project properties and selecting 1.1 from a dropdown. When creating the project I can update the framework to the latest version, but I am not sure that is worth anything. Code for this change is available at ILMTitan/set-template-framework-latest

I also could add a pop-up to ask which framework version to use, but I don't think that provides any benefit above the project properties.

[ILMTitan]

I am going to enable the code to set the framework to the latest version. Reopening to track that.

[ILMTitan]

Fixed in PR #792.