Fix build after clean.

Fix version discrepancy between csproj and packages for Newtonsoft.Json.

Packages.config says 4.5.6 but HintPath in csproj had 4.5.9. Fixing this discrepancy allows the first build.cmd after git clean -xdf to succeed; previously, it failed.

Author: davidmatson

src/Microsoft.AspNet.Mvc.Facebook/Microsoft.AspNet.Mvc.Facebook.csproj

@@ -44,7 +44,7 @@
       <HintPath>..\..\packages\Microsoft.Web.Infrastructure.1.0.0.0\lib\net40\Microsoft.Web.Infrastructure.dll</HintPath>
     </Reference>
     <Reference Include="Newtonsoft.Json">
-      <HintPath>..\..\packages\Newtonsoft.Json.4.5.9\lib\net40\Newtonsoft.Json.dll</HintPath>
+      <HintPath>..\..\packages\Newtonsoft.Json.4.5.6\lib\net40\Newtonsoft.Json.dll</HintPath>
     </Reference>
     <Reference Include="System" />
     <Reference Include="System.ComponentModel.DataAnnotations" />