naive_map/1 utility is inspired by Rails Hash.from_xml() but is "naive" in that it is convenient (requires no setup) but carries the same drawbacks.

For example no validation over what should be a collection. If and only if nodes are repeated at the same level will they become a list. If a node has attributes we'll prepend a "-" in front of them and merge them into the map and take the node value and nest that inside "#content" key.