Option to inherit from a default config file

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I'm using a default s3_website.yml config file for all my websites, and using environment variables to customise it for each website's needs. On problem though is s3_website auto-adds cloudfront_distribution_id into the abstract config file.

Possibly solutions would either be:

• Print out the cloudfront_distribution_id rather than editing the config file
• Allowing inheritance of a defaults config file (e.g. allow multiple configs to be passed in cmd line)

Thanks for this project