Nicer configuration loading

[dryewo]

Currently there is some annoying code duplication - first you load the configuration mentioning the namespaces, then you explicitly pull apart the loaded config map to give each component its part. Each component name has to be mentioned several times, and it's always repetitive

:NAME (map->NAME {:configuration (:NAME config)})

in the system map.

Consider using the approach from here: https://github.com/AvisoNovate/config
Or just use the library itself.