AerisBatchModel: each endpoint get's its own attribute

- Allows multiple requests from the same endpoint
  (eg. forecast-daily, forecast-hourly)
Params: accept raw `filter` option

- rather than needing to pass in FilterCollection instance
Params: Do not re-bind events to new query attr

- Removes low-value / high-complexity code
Params: auto-format
Docs: add api model to list of supported endpoints
Docs: Batch Requests