add plugin security to internal nuget pkg

MediaBrowser.Common.Implementations/MediaBrowser.Common.Implementations.csproj

@@ -203,6 +203,7 @@
   <PropertyGroup>
     <PostBuildEvent>if $(ConfigurationName) == Release (
 xcopy "$(TargetPath)" "$(SolutionDir)\Nuget\dlls\" /y /d /r /i
+xcopy "$(TargetDir)Mediabrowser.PluginSecurity.dll" "$(SolutionDir)\Nuget\dlls\" /y /d /r /i
 )</PostBuildEvent>
   </PropertyGroup>
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 

Nuget/MediaBrowser.Common.Internal.nuspec

@@ -24,5 +24,6 @@
         <file src="dlls\MediaBrowser.Common.Implementations.dll" target="lib\net45\MediaBrowser.Common.Implementations.dll" />
         <file src="dlls\MediaBrowser.IsoMounter.dll" target="lib\net45\MediaBrowser.IsoMounter.dll" />
         <file src="dlls\pfmclrapi.dll" target="lib\net45\pfmclrapi.dll" />
+        <file src="dlls\Mediabrowser.PluginSecurity.dll" target="lib\net45\Mediabrowser.PluginSecurity.dll" />
     </files>
 </package>