Update aws_s3.rst to follow the currently mainted library

[appeltaert]

• Changed the link to new one
• Changed the config to follow the new factory, and a block below it for the deprecated verison
• Added the mandatory version parameter

[dincho]

I'm getting Invalid type for path "liip_imagine.resolvers.images_s3.aws_s3.client_config.XXXXX". Expected scalar, but got array. with below config:

liip_imagine:
    cache:      images_s3
    resolvers:
        images_s3:
            aws_s3:
                client_config:
                    credentials: 
                        key: %amazon_s3.key%
                        secret: %amazon_s3.secret%
                    region: %amazon_s3.region%
                    version: %amazon_s3.version%
                bucket:     %amazon_s3.images_cache_bucket%
                proxies:    %amazon_s3.proxies%

This is because client_config prototype accepts only scalars, but credentials is array.
AwsS3ResolverFactory should be modified to reflect this configuration.

[dincho]

Oh, this is service configuration sorry. Unrelated comment.

[lsmith77]

see this comment here #620 (comment)

[makasim]

fixed in #685. available since 1.4.1