Modified NuGet.config to override the global NuGet.config (#29)

NuGet.Config

@@ -14,4 +14,8 @@
   <solution>
     <add key="disableSourceControlIntegration" value="true" />
   </solution>
+  <!-- This is used to override the global NuGet.config and enable nuget.org -->
+  <disabledPackageSources>
+    <clear />
+  </disabledPackageSources>
 </configuration>