Docced it up for S3

git-svn-id: https://svn.thoughtbot.com/plugins/paperclip/trunk@223 7bbfaf0e-4d1d-0410-9690-a8bb5f8ef2aa

lib/paperclip/paperclip.rb

@@ -103,6 +103,21 @@ module ClassMethods
       #   URL, not relative to the +url_prefix+. This field is interpolated.
       #     has_attached_file :avatar, :missing_url => "/images/default_:style_avatar.png"
       #     User.new.avatar_url(:small) # => "/images/default_small_avatar.png"
+      # * +storage+: Paperclip has two ways of storing your files. The first is on the filesystem, as specified by
+      #   the +path_prefix+ and +path+ parameters. The second is using Amazon's S3 service, via the AWS::S3 gem.
+      #   When +storage+ is set to :s3, Paperclip will at :s3_credentials_file in its options for a path to a YAML
+      #   file that will specify the access_key_id and secret_access_key for S3. If none is specified, it will look
+      #   for a the same file at the default location of +RAILS_ROOT/config/s3.yml+. When using S3, the +url_prefix+
+      #   is the name of the bucket in which the files will be stored. Note that while the +url_prefix+ is still
+      #   interpolated, S3 does not allow anything but alphanumerics and underscores, so it's a good practice to keep
+      #   your interpolations to the +path+ parameter. Files are stored with default permissions of :public_read. You
+      #   can read more about AWS::S3 here[http://amazon.rubyforge.org/].
+      #   Please note that S3 support is still experimental in Paperclip and does not have full test coverage. Use
+      #   at your own risk.
+      #     has_attached_file :avatar, :storage => :s3
+      #                       :url_prefix => "bucket",
+      #                       :path => ":attachment/:style/:id/:name"
+      #     user.avatar_url # => "http://s3.amazonaws.com/bucket/avatars/original/13/me.png"
       #
       # == Interpolation
       # The +path_prefix+, +url_prefix+, and +path+ options can have dynamic interpolation done so that the 

lib/paperclip/storage/filesystem.rb

@@ -1,6 +1,6 @@
 module Thoughtbot
   module Paperclip
-    module ClassMethods
+    module ClassMethods #:nodoc:
 
       def has_attached_file_with_fs *attachment_names
         has_attached_file_without_fs *attachment_names
@@ -9,8 +9,8 @@ def has_attached_file_with_fs *attachment_names
 
     end
 
-    class Storage
-      class Filesystem < Storage
+    class Storage #:nodoc:
+      class Filesystem < Storage #:nodoc:
         def path_for attachment, style = nil
           style ||= attachment[:default_style]
           file = attachment[:instance]["#{attachment[:name]}_file_name"]

lib/paperclip/storage/s3.rb

@@ -1,6 +1,6 @@
 module Thoughtbot
   module Paperclip
-    module ClassMethods
+    module ClassMethods #:nodoc:
       def has_attached_file_with_s3 *attachment_names
         attachments, options = has_attached_file_without_s3 *attachment_names
 
@@ -35,8 +35,8 @@ def s3_credentials_file
       end
     end
 
-    class Storage
-      class S3 < Storage
+    class Storage #:nodoc:
+      class S3 < Storage #:nodoc:
         def path_for attachment, style = nil
           style ||= attachment[:default_style]
           file = attachment[:instance]["#{attachment[:name]}_file_name"]