Run VS2013-compatible FxCop rules on VS2013.

.nuget/vs2013/packages.config

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<packages>
+  <package id="Microsoft.Web.FxCop" version="2.0.0" />
+</packages>

Runtime.msbuild

@@ -70,6 +70,7 @@
            RestorePackages against every project. -->
       <RestorePackages
           Include=".nuget\packages.config;
+                   .nuget\vs2013\packages.config;
                    src\Microsoft.AspNet.Mvc.Facebook\packages.config;
                    src\Microsoft.Web.WebPages.OAuth\packages.config;
                    src\System.Net.Http.Formatting.NetCore\packages.config;
@@ -80,6 +81,15 @@
     </ItemGroup>
     <Message Text="Restoring NuGet packages..." Importance="High" />
     <Exec Command='"$(NuGetExe)" restore "%(RestorePackages.Identity)" -PackagesDirectory packages -NonInteractive -Verbosity quiet -ConfigFile .nuget\NuGet.Config' />
+    <!-- Pick the right Microsoft.Web.FxCop package to use and copy it to a standard location. -->
+    <PropertyGroup>
+      <CustomFxCopRulesPath>packages\CustomFxCopRules</CustomFxCopRulesPath>
+      <MicrosoftWebFxCopVersion Condition=" '$(MicrosoftWebFxCopVersion)' == '' and '$(MSBuildToolsVersion)' == '12.0' ">2.0.0</MicrosoftWebFxCopVersion>
+      <MicrosoftWebFxCopVersion Condition=" '$(MicrosoftWebFxCopVersion)' == '' ">1.0.1</MicrosoftWebFxCopVersion>
+    </PropertyGroup>
+    <Copy Condition="!Exists('$(CustomFxCopRulesPath)\Microsoft.Web.FxCop.dll')"
+          SourceFiles="packages\Microsoft.Web.FxCop.$(MicrosoftWebFxCopVersion)\Microsoft.Web.FxCop.dll"
+          DestinationFolder="$(CustomFxCopRulesPath)" />
   </Target>
 
   <Target Name="Build" DependsOnTargets="RestorePackages">

src/Strict.ruleset

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <RuleSet Name="FxCop rules for ASP.NET Web Stack" Description="This rule set contains the rules for ASP.NET Web Stack." ToolsVersion="10.0">
   <RuleHintPaths>
-    <Path>..\packages\Microsoft.Web.FxCop.1.0.1</Path>
+    <Path>..\packages\CustomFxCopRules</Path>
   </RuleHintPaths>
   <IncludeAll Action="Error" />
   <Rules AnalyzerId="Microsoft.Analyzers.ManagedCodeAnalysis" RuleNamespace="Microsoft.Rules.Managed">