[WIP] V3 API

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This is no where near done. But I wanted to open up the PR now, so it's development would be visible and there'd be a means for discussion.


* [x] - Get Sinatra app in for API
* [x] - Set up env for testing API
* [x] - Design endpoints
* [x] - Add hash methods to models so we can dump to JSON
* [x] - Make the empty endpoints actually do things