Move NuGet.config to repo root (#374)

- not sure why this wasn't done ages ago

Runtime.msbuild

@@ -60,7 +60,7 @@
   </Target>
 
   <Target Name="RestoreSkipStrongNames" DependsOnTargets="DownloadNuGet">
-    <Exec Command='"$(NuGetExe)" restore .nuget\packages.config -PackagesDirectory packages -NonInteractive -Verbosity quiet -ConfigFile .nuget\NuGet.Config' />
+    <Exec Command='"$(NuGetExe)" restore .nuget\packages.config -PackagesDirectory packages -NonInteractive -Verbosity quiet' />
   </Target>
 
   <Target Name="RestorePackages" DependsOnTargets="DownloadNuGet">
@@ -77,8 +77,7 @@
 
     <Message Text="Restoring NuGet packages..." Importance="High" />
     <Exec Command='"$(NuGetExe)" restore "%(_NuGetPackagesAndSolutions.Identity)" ^
-        -PackagesDirectory packages -NonInteractive ^
-        -Verbosity quiet -ConfigFile "$(MSBuildThisFileDirectory)\.nuget\NuGet.Config"' />
+        -PackagesDirectory packages -NonInteractive -Verbosity quiet' />
     <MSBuild Projects="@(_ProjectsToRestore)" Targets="Restore"
       BuildInParallel="$(BuildInParallel)"
       Condition=" '$(BuildPortable)' == 'true' "

Runtime.sln

@@ -97,7 +97,7 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "System.Web.Http.Owin.Test",
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = ".nuget", ".nuget", "{CB34D534-9A09-4EE4-B350-C1C23AFBF5EE}"
 	ProjectSection(SolutionItems) = preProject
-		.nuget\NuGet.Config = .nuget\NuGet.Config
+		NuGet.Config = NuGet.Config
 		.nuget\packages.config = .nuget\packages.config
 	EndProjectSection
 EndProject