Permission issue using ACL

Hi there,

I use ACL to set permissions on certain directories upon deployment. Here's the part of `deploy.rb`:

```
set :linked_files, ['app/config/parameters.yml']
set :linked_dirs, ["app/logs", "web/uploads"]

set :permission_method, :acl
set :file_permissions_paths, ["app/logs", "app/cache", "web/uploads"]
set :file_permissions_users, ["www-data"]

before "deploy:updated", "deploy:set_permissions:acl"
```

So this works on the first deployment, when you set up your directories where nothing has been created inside them yet. However, after some time, say you uploaded an image to the `web/uploads` directory, the file would be under the `www-data` user, while the directory is still owned by the deploy user. So when you deploy code again, capistrano will fail because it attempts to run acl on a directory that contains files owned by `www-data`.

How can I work around this?

Start with the deploy.rb permission configuration shown in the issue and reproduce a second deployment after a file exists in web/uploads under www-data. Trace the deploy:set_permissions:acl task and determine the expected behavior for directories containing files with different ownership; done means a repeat deployment completes without the ACL failure.

Written by the indexing model from the issue text.