Try restoring mention of TestCommon's packages.config

Author: dougbu

packages/repositories.config

@@ -17,6 +17,7 @@
   <repository path="..\src\WebApiHelpPage\packages.config" />
   <repository path="..\src\WebApiHelpPage\VB\packages.config" />
   <repository path="..\test\Microsoft.AspNet.Facebook.Test\packages.config" />
+  <repository path="..\test\Microsoft.TestCommon\packages.config" />
   <repository path="..\test\Microsoft.Web.Helpers.Test\packages.config" />
   <repository path="..\test\Microsoft.Web.Mvc.Test\packages.config" />
   <repository path="..\test\Microsoft.Web.WebPages.OAuth.Test\packages.config" />