Be able to escale URL characters more easily

Including + now.

lib/paperclip/url_generator.rb

@@ -58,7 +58,15 @@ module Paperclip
     end
 
     def escape_url(url)
-      (url.respond_to?(:escape) ? url.escape : URI.escape(url)).gsub(/(\/.+)\?(.+\.)/, '\1%3F\2').gsub(/\(/, '%28').gsub(/\)/, '%29').gsub(/\[/, '%5B').gsub(/\]/, '%5D')
+      if url.respond_to?(:escape)
+        url.escape
+      else
+        URI.escape(url).gsub(escape_regex){|m| "%#{m.ord.to_s(16).upcase}" }
+      end
+    end
+
+    def escape_regex
+      /[\?\(\)\[\]\+]/
     end
   end
 end