Save raw content to S3

[kylepolich]

Requirements

As described in #11, there will be different "types" of messages sent to the API.

• I the message received is of type raw, store it in S3
• S3 key should match the pattern:

user/{username}/inbox/{yyyy}/{mm}/{dd}/{slug}

• What is slug? Create a function like this: get_slug(url) which takes the origin URL of the content and returns md5(url) + timestamp. Later we will make this nice. For now it is fine.

Acceptance Criteria

Please send a screencast using the plugin to demonstrate the capture and then aws s3 ls s3://bucketname/user/me/2020/01/26/{slug} to show me the content.