Clear out system dir on each build

MediaBrowser.ServerApplication/MediaBrowser.ServerApplication.csproj

@@ -368,6 +368,7 @@
     <PostBuildEvent>xcopy "$(SolutionDir)\packages\System.Data.SQLite.1.0.84.0\content\net40\x86\SQLite.Interop.dll" "$(TargetDir)" /y
 
 if $(ConfigurationName) == Release (
+rmdir "$(SolutionDir)..\Deploy\Server\System" /s /q
 mkdir "$(SolutionDir)..\Deploy\Server\System"
 xcopy "$(TargetDir)$(TargetFileName)" "$(SolutionDir)..\Deploy\Server\System\" /y
 xcopy "$(SolutionDir)Mediabrowser.Uninstaller\bin\Release\MediaBrowser.Uninstaller.exe.config" "$(SolutionDir)..\Deploy\Server\System\" /y

MediaBrowser.sln

@@ -237,7 +237,4 @@ Global
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
 	EndGlobalSection
-	GlobalSection(Performance) = preSolution
-		HasPerformanceSessions = true
-	EndGlobalSection
 EndGlobal