Add :postcode_anywhere_uk lookup.

Handle responses that only have one component in the Location field, assume this is a county and so return blank city

Add PostcodeAnywhere API error handling; Map key limit exceeded, invalid key to Geocode errors and call all others as just Error

Limit maxmind local subselect query to reduce cost

Since we only want to select one IP block anyway, limiting this query
reduces the query cost from (cost=22531.65..22539.67 rows=1 width=31)
to (cost=0.53..8.54 rows=1 width=31)

IPv6 loopback ip ::1 should be detected as a valid loopback ip..

Integrate the Google Places Details API

Add IPv6 format detection

See: http://smartystreets.com/kb/liveaddress-api/rest-endpoint

updates smarty streets api key requirements

Document google free API requiring https

I stumbled here, ended up finding the answer in the [issues](https://github.com/alexreisner/geocoder/issues/698). Would be great to document this in the main readme.

Update to Bing on README on usage.