We've deprecate these method for a while, it's time to remove it.

Fixes #723

Fixes #646

`AWS::S3::Base.establish_connection!` is not on the `aws/sdk`, and this code doesn't get used anymore.

This reverts commit 58671ebf.

I am reverting this because the tests broke and because the code itself
looks hideous.

Removes the redundant term "file size"

Paperclip#run now respects swallow_stderr setting. Fix for #741

Fixes #743

Fixes #745

We aren't really sure if Rails even work on rbx-19mode, as it's on rapid developemnt. We should disble that for now.

replace Paperclip::Attachment#initialize options with an AttachmentOptions instance

In the effort of decoupling Rails from unit specs, you can't have any code that calls `Rails` (since it isn't available). In my unit specs that need Paperclip, I call `Paperclip::Railtie.insert` and all is good :)