Closes #389, Closes #390

Closes #213

Closes #170

added :preserve_files option so paperclip can get along with soft-delete plugins like acts_as_paranoid

Closes #152

Closes #62

Closes #105

Closes #495

Closes #133, Closes 288

Closes #214

Closes #216

Example:
  has_attached_file :image,
    :bucket => "testing",
    :path => ":attachment/:style/:basename.:extension"
    :s3_permissions => {
      :original => :private
    },
    :styles => {
      :thumb => '80x80>'
    }

The above will allow public read access on :thumb but require credentials for :original.

Example of setting default to private:
  has_attached_file :image,
    :bucket => "testing",
    :path => ":attachment/:style/:basename.:extension"
    :s3_permissions => :private
    :styles => {
      :thumb => '80x80>'
    }

The above will set all to private

Closes #398

Closes #100

Closes #388

The tests would broken for StringIO, because it doesn't have a real "path". I've modify the patch to make the test stop complaining [@sikachu]

This closes #470

Editing the readme to include information on `:hash`

Closes #286

Closes #499

the :default_url option for has_attached_file can now also be a Proc/lamba, which gets executed *before* it gets interpolated

Closes #253, Closes #360

Closes #332

Closes #466

This patch only avoid reference to `ActiveRecord::Base.logger` if `ActiveRecord` is not available

`Module#const_get` was unreliable on returning the right constant. We should check if the constant has been defined first before trying to call `Module#const_get`

Fix problem that Module#const_get might try to lookup the constant in the ancestor class, and fixing the strange error from Rails 2.3.x dependency management

Closes #478