disable CO signing

MediaBrowser.ServerApplication/MediaBrowser.ServerApplication.csproj

@@ -79,7 +79,7 @@
     <GenerateManifests>true</GenerateManifests>
   </PropertyGroup>
   <PropertyGroup>
-    <SignManifests>true</SignManifests>
+    <SignManifests>false</SignManifests>
   </PropertyGroup>
   <PropertyGroup>
     <ManifestTimestampUrl>http://timestamp.verisign.com/scripts/timstamp.dll</ManifestTimestampUrl>