Revert "Packages folder is ignored correctly".

Without the asterisk at the end of the directory's path, an exception for
a file within this directory does not work.
(ex. !packages/repositories.config)

This reverts commit 0fb0fbefa5.

VisualStudio.gitignore

@@ -124,7 +124,7 @@ publish/
 *.pubxml
 
 # NuGet Packages Directory
-packages/
+packages/*
 ## TODO: If the tool you use requires repositories.config uncomment the next line
 #!packages/repositories.config