Unlink before uninstalling

Nice bug there where we never removed any symlinks, because the unlink step requires the keg to be full of files to determine what symlinks to remove.

bin/brew

@@ -161,8 +161,8 @@ begin
     when 'rm', 'uninstall', 'remove'
       ARGV.kegs.each do |keg|
         puts "Uninstalling #{keg}..."
-        keg.uninstall
         keg.unlink
+        keg.uninstall
       end
 
     when 'prune'