update server core project

Emby.Server.Core/UnhandledExceptionWriter.cs

@@ -3,7 +3,7 @@ using MediaBrowser.Model.Logging;
 using System;
 using System.IO;
 
-namespace MediaBrowser.Server.Startup.Common
+namespace Emby.Server.Core
 {
     public class UnhandledExceptionWriter
     {

Emby.Server.Core/project.json

@@ -8,7 +8,7 @@
   "frameworks": {
     "net46": {
       "frameworkAssemblies": {
-        
+        "System.Runtime": "4.0.0"
       },
       "dependencies": {
         "MediaBrowser.Model": {

MediaBrowser.Server.Startup.Common/MediaBrowser.Server.Startup.Common.csproj

@@ -172,7 +172,6 @@
     <Compile Include="Sync\SyncRepository.cs" />
     <Compile Include="SystemEvents.cs" />
     <Compile Include="TextLocalizer.cs" />
-    <Compile Include="UnhandledExceptionWriter.cs" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\Emby.Dlna\Emby.Dlna.csproj">