Fixed bug in including paperclip storage modules with underscores.

lib/paperclip/attachment.rb

@@ -323,7 +323,7 @@ module Paperclip
     end
     end
 
 
     def initialize_storage #:nodoc:
     def initialize_storage #:nodoc:
-      storage_class_name = @storage.to_s.capitalize
+      storage_class_name = @storage.to_s.camelize
       begin
       begin
         @storage_module = Paperclip::Storage.const_get(storage_class_name)
         @storage_module = Paperclip::Storage.const_get(storage_class_name)
       rescue NameError
       rescue NameError