Use http-client instead of http-conduit
Use `each` instead of `mapM_ yield`
Make Service.AMEDAS.download a Producer

It just returns a list at this moment because tagsoup doesn't support streaming.
Treat warnings as errors on release build
Add Service.AMEDAS.Stations.station
Serialize items using pipes
Use many1 from Data.Attoparsec.Combinator
Parse AMEDAS csv using pipes-attoparsec