update README
add format :unknown (default)
update conversions to use :unknown format
update cassette names for web services
use proper namespacing in weather service specs
Move Google Geocode specific behaviour into GoogleGeocode class
allow XmlParser to take a block, just like JsonParser
Yahoo geocode service now returns a Geo object
prevent duplicate conversions from happening
README cleanup
use DataTypes in Data::Geo
README cleanup
only store Query#country_code in one place
allow merging of Query#geo meta data
no longer use query geo data in weather service results
cleanup weather service requesters