Add packages required for updated sources

Commands.Utility now needs Microsoft.CodeAnalysis.CSharp, which doesn't
explicitly target `dnxcore50`, so now Commands.Utility and the packages
which depend on it now much `import` the Portable Windows framework.
This also required adding the aspnetvnext feed.

System.Management.Automation now requires System.Diagnostics.StackTrace.

nuget.config

@@ -2,6 +2,7 @@
 <configuration>
   <packageSources>
     <add key="dotnetcore" value="https://www.myget.org/F/dotnet-core/" />
+    <add key="aspnetvnext" value="https://www.myget.org/F/aspnetvnext/" />
     <add key="nuget.org" value="https://www.nuget.org/api/v2/" />
   </packageSources>
   <disabledPackageSources />

src/Microsoft.PowerShell.Commands.Utility/project.json

@@ -14,13 +14,14 @@
 
     "dependencies": {
 	"NETStandard.Library": "1.0.0-rc2-23712",
+	"Microsoft.CodeAnalysis.CSharp": "1.1.0-rc1-20151109-01",
 	"System.Management.Automation": {
 	    "type": "build",
 	    "version": "1.0.0-*"
 	}
     },
 
-    "frameworks": { "dnxcore50": { } },
+    "frameworks": { "dnxcore50": { "imports": "portable-net45+win8" } },
 
     "compile": [ "../windows-build/gen/COMMANDS_UTILITY/*.cs" ],
 

src/Microsoft.PowerShell.Linux.Host/project.json

@@ -25,5 +25,5 @@
 	}
     },
 
-    "frameworks": { "dnxcore50": { } }
+    "frameworks": { "dnxcore50": { "imports": "portable-net45+win8" } }
 }

src/System.Management.Automation/project.json

@@ -23,6 +23,7 @@
 	"System.Data.Common": "4.0.1-rc2-23712",
 	"System.Diagnostics.Contracts": "4.0.1-rc2-23712",
 	"System.Diagnostics.FileVersionInfo": "4.0.0-rc2-23712",
+	"System.Diagnostics.StackTrace": "4.0.1-rc2-23712",
 	"System.Diagnostics.TraceSource": "4.0.0-rc2-23712",
 	"System.Dynamic.Runtime": "4.0.11-rc2-23712",
 	"System.IO.FileSystem.AccessControl": "4.0.0-rc2-23712",

test/csharp/project.json

@@ -11,5 +11,5 @@
 	},
     },
 
-    "frameworks": { "dnxcore50": { } }
+    "frameworks": { "dnxcore50": { "imports": "portable-net45+win8" } }
 }