Added upload/.placeholder so the directory gets created.

* Modified the main view to ignore the placeholder.

plemp.rb

@@ -91,6 +91,7 @@ module Plemp::Views
       end
     end
     UPLOAD_DIR.entries.select { |f| (UPLOAD_DIR + f).file? }.each do |f|
+      next if f.to_s =~ /^\./
       file = UPLOAD_DIR + f
       id = file.basename.to_s
       if Positions.has_key? id

upload/.placeholder

@@ -0,0 +1 @@
+This is a placeholder for Git.