We need to handle arbitrary exceptions in this task, especially since the
task is not easily resumable.
Simply output problem uploads as you hit them for now.
Some previous migrations to S3 may have bad ACLs set on objects. This
introduces a new rake task (`rake s3:correct_acl`) that will reset ACL on
every S3 object.
Vast majority of users will never have to run it, but if you have ACL issues
this is the atomic solution.
This refactors handling of s3 so it can be specified via GlobalSetting
This means that in a multisite environment you can configure s3 uploads
without actual sites knowing credentials in s3
It is a critical setting for situations where assets are mirrored to s3.
