Deploy features/yoshi_pins

[zhangchuck]

• Implemented parts of #71 for intial testing.

Finished

• !put/!p command
• !get/!g command
• basic persistence on the docker container

Still to-do

• [x] Backing up the database to S3 (skeleton added)
• [x] Retrieving the database on restart of docker (skeleton added)
• [x] List all existing pins (need to discuss UI)
• [x] Figure out why the quote-bot-dev is not picking up the !g !p and !l commands - [ ] Improve the matching for the !list command (skeleton added)
• [x] Create an S3 bucket - [ ] Generate credentials (aws_access_key_id and aws_secret_access_key) - [ ] Pass credentials to docker environment

Notes on credential passing:

the IAM role is in the EC2 instance metadata, some googling suggest that docker containers on the instance have access to that metadata already

[zhangchuck]

Note that this feature is not working on quote-bot-dev yet. We'll need to inspect the logs at some point.

[zhangchuck]

Issue with deployment was that we ran out of diskspace and the image wouldn't download properly. To fix this, we make sure to prune docker every time we redeploy:

play4honor/p4h_webhooks@b8d2675

[zhangchuck]

Remember to pull the hardcoded bucket name and place it into an environment variable

[zhangchuck]

• [ ] Improve the matching for the !list command (skeleton added) will be moved to its own issue.