Update test project.json to not depend on Moq for CoreCLR.

test/Microsoft.AspNet.Razor.Test/project.json

@@ -2,7 +2,6 @@
   "version": "1.0.0",
   "resource": "TestFiles/**/*",
   "dependencies": {
-        "Moq": "4.2.1312.1622",
     "Microsoft.AspNet.Razor": "4.0.0-*",
     "Microsoft.AspNet.Testing": "1.0.0-*",
     "xunit.runner.aspnet": "2.0.0-aspnet-*"
@@ -11,7 +10,11 @@
     "test": "xunit.runner.aspnet"
   },
   "frameworks": {
-        "dnx451": { },
+    "dnx451": {
+      "dependencies": {
+        "Moq": "4.2.1312.1622"
+      }
+    },
     "dnxcore50": {
       "dependencies": {
         "System.Diagnostics.TraceSource": "4.0.0-beta-*",