add new query format: IPv4 Address
rename Yahoo Geocode API
use Yahoo weather to convert weather_id -> geocode
use Yahoo Geocode for WoeId and IPv4 -> geocode
use require_relative
Smarter query conversion selection

- If an intermediate query conversion has the side effect
  of producing a higher preffered conversion, then use that
  conversion instead
woe_id service can accept an ipv4 address input
update readme to list IPv4
bump version -> 0.9.0