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New in 2.7.5:* Feature: :s3_host_name can be a procNew in 2.7.4:* Feature: Allow :escape_url as an option in the defaults* Bug fix: Correcting some PATH-based tests.* Compatability: Cucumber tests work for Rails 3.2.8New in 2.7.2* Bug fix: Ensured the correct cocaine version.* Bug fix: Fixed some tests that shouldn't have been passing.New in 2.7.1:* Bug fix: Fixed the problem with E2BIG errors and an ever-expanding pathNew in 2.7.0:* Bug fix: Checking the existence of a file on S3 handles all AWS errors.* Bug fix: Clear the fingerprint when removing an attachment.* Bug fix: Attachment size validation message reads more nicely now.* Feature: Style names can be either symbols or strings.* Compatibility: Support for ActiveSupport < 2.3.12.* Compatibility: Support for Rails 3.2.New in 2.6.0:* Bug fix: Files are re-wound after reading.* Feature: Remove Rails dependency from specs that need Paperclip.* Feature: Validation matchers support conditionals.New in 2.5.2:* Bug fix: Can be installed on Windows.* Feature: The Fog bucket name, authentication, and host can be determined at runtime via Proc.* Feature: Special characters are replaced with underscores in #url and #path.New in 2.5.1:* Feature: After we've computed the content type, pass it to Fog.* Feature: S3 encryption with the new :s3_server_side_encryption option.* Feature: Works without ActiveRecord, allowing for e.g. mongo backends.New in 2.5.0:* Performance: Only connect to S3 when absolutely needed.* Bug fix: STI with cached classes respect new options.* Bug fix: conditional validations broke, and now work again.* Feature: URL generation is now parameterized and can be changed with plugins or custom code.* Feature: :convert_options and :source_file_options to control the ImageMagick processing.* Performance: String geometry specifications now parse more quickly.* Bug fix: Handle files with question marks in the filename.* Bug fix: Don't raise an error when generating an expiring URL on an unassigned attachment.* Bug fix: The rake task runs over all instances of an ActiveRecord model, ignoring default scopes.* Feature: DB migration has_attached_file and drop_attached_file methods.* Bug fix: Switch from AWS::S3 to AWS::SDK for the S3 backend.* Bug fix: URL generator uses '?' in the URL unless it already appears and there is no prior '='.* Bug fix: Always convert the content type to a string before stripping blanks.* Feature: The :keep_old_files option preserves the files in storage even when the attachment is cleared or changed.* Performance: Optimize Fog's public_url access by avoiding it when possible.* Bug fix: Avoid a runtime error when generating the ID partition for an unsaved attachment.* Performance: Do not calculate the fingerprint if it is never persisted.* Bug fix: Process the :original style before all others, in case of a dependency.* Feature: S3 headers can be set at runtime by passing a proc object as the value.* Bug fix: Generating missing attachment styles for a model which has had its attachment changed should not raise.* Bug fix: Do not collide with the built-in Ruby hashing method.