Publish fsc for .net core runtime 1.1

[enricosada]

From dotnet sdk team feedback, the .net core 1.0 is not avaiabile in all os supported by .net core sdk (for example ubuntu 16.10) ref dotnet/netcorecli-fsc#76

In these os just .net core 1.1 is supported.

From dotnet/netcorecli-fsc#76 (comment) probably the netcore 1.1 will be the reccomended runtime for all os in rtm too.

The Microsoft.Fsharp.Compiler.netcore is using Microsoft.NETCore.Platforms/1.0.1, but should use 1.1.0.
And be another parallel package versions probably, because deps.

So can be added into FSharp.Compiler.Tools later (i'll fix choose based on installed runtimes in FSharp.Core.Sdk targets )

NOTE i need just fsc published, not the package itself, ref fsharp/fsharp repo packaging

[cartermp]

cc @KevinRansom - looks like we need to update the compiler package. Personally I'm fine with .NET Core 1.1 being the recommended target for apps. The LTS/Current split isn't quite so strong now, especially with .NET Core 2.0 on the horizon.

[dsyme]

This has been done