Revert "No need to muck around with request.env['rack.input'], just use params['file'] from Rack::RawUpload."
Revert "No need to muck around with request.env['rack.input'], just use params['file'] from Rack::RawUpload."

This reverts commit 94d8882d2314caf7622be548797648e93e3902e9.

masondesu/active_admin_editor_fixes,masondesu/active_admin_editor_fixes