Path.GetFullPath in netstandard1.2 can not be builded

[Sebosek]

Hi there,

I want to use Path.GetFullPath in class library targeting to netstandard1.2 but build ends up with: 'Path' does not contain a definition for 'GetFullPath'.
By description at nuget.org I should use netstandard1.0, netstandard 1.3 or 1.5 (Why just odd versions?), So I decide to target at 1.0, but still build is ending with described error. What am I missing?
(One of application what this library should use is asp.net core webapi running at .net fw 4.5.1)

Here is my project.json

{
  "dependencies": {
    "NETStandard.Library": "1.0.0-rc2-24027",
    "System.Diagnostics.FileVersionInfo": "4.0.0-rc2-24027",
    "Microsoft.AspNetCore.Mvc": "1.0.0-rc2-final",
    "System.Runtime.Extensions": "4.1.0-rc2-24027",
    "System.Runtime": "4.1.0-rc2-24027"
  },

  "frameworks": {
    "netstandard1.0": {
      "imports": [
        "dnxcore50",
        "dnx451"
      ]
    }
  },

  "version": "1.0.0-*"
}

[Tratcher]

This is a question for https://github.com/dotnet/corefx or nuget.

[aspnet-hello]

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