added street_address attribute for geocodio, updated fixture and outdated attribute tests

Set longitude in example to minus instead of positive.

and format for consistency.

Use UTF-8 encoding for :maxmind_local results from file.

GeoLite2 is a free version of a product called GeoIP2. Both use the same
format.

Use faster ruby methods

See: https://speakerdeck.com/sferik/writing-fast-ruby

Fixes OID warnings when using PostgreSQL

Postgres correctly identifies OIDs when BEARING and DISTANCE contain
numerical values. It fails to identify OID for a NULL type.

This patch explicitly sets an OID type for NULLs when running in
PostgreSQL environment.

Add table_name to AR geocoded and not_geocoded scopes

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