Update VisualStudio.gitignore

New web deploy file name? vs 2012 added this to my solution and it shouldn't go to an open repo.

VisualStudio.gitignore

@@ -84,6 +84,7 @@ publish
 
 # Publish Web Output
 *.Publish.xml
+*.pubxml
 
 # NuGet Packages Directory
 ## TODO: If you have NuGet Package Restore enabled, uncomment the next line