Add S3 storage samples files

examples/s3/attachment_file.rb

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+class AttachmentFile < Asset
+
+  # === List of columns ===
+  # id : integer
+  # data_file_name : string
+  # data_content_type : string
+  # data_file_size : integer
+  # assetable_id : integer
+  # assetable_type : string
+  # type : string
+  # locale : integer
+  # user_id : integer
+  # created_at : datetime
+  # updated_at : datetime
+  # =======================
+
+  has_attached_file :data,
+                    :s3_credentials => "#{Rails.root}/config/s3.yml", :bucket => "yourbucket",
+                    :storage => :s3,
+                    :path => "#{APP_NAME}/files/:id/:filename"
+
+  validates_attachment_size :data, :less_than => 10.megabytes
+end

examples/s3/picture.rb

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+class Picture < Asset
+
+  # === List of columns ===
+  # id : integer
+  # data_file_name : string
+  # data_content_type : string
+  # data_file_size : integer
+  # assetable_id : integer
+  # assetable_type : string
+  # type : string
+  # locale : integer
+  # user_id : integer
+  # created_at : datetime
+  # updated_at : datetime
+  # =======================
+
+
+
+  has_attached_file :data,
+  :s3_credentials => "#{Rails.root}/config/s3.yml", :bucket => "yourbucket",
+  :storage => :s3,
+  :path => "#{APP_NAME}/images/:id/:style_:basename.:extension",
+  :styles => { :content => '575>', :thumb => '100x100' }
+
+  validates_attachment_size :data, :less_than=>2.megabytes
+
+  def url_content
+    url(:content)
+  end
+
+  def url_thumb
+    url(:thumb)
+  end
+
+  def to_json(options = {})
+    options[:methods] ||= []
+    options[:methods] << :url_content
+    options[:methods] << :url_thumb
+    super options
+  end
+end

examples/s3/s3.yml

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+access_key_id: "YOUR KEY ID"
+secret_access_key: "YOUR SECRET KEY"