Fix Yandex city error when JSON does not include 'AdministrativeArea'

This reverts commit 082c526d, reversing
changes made to 242a29f8.

Some regions appear to not return this in JSON

Update README.md

Use conventional single quotes in Gemfile

Remove duplicated code

Adds ability to raise error when response parsing fails

FIX instructions for use MaxMind Local ip lookup

Google and Okf perform additional checks to determine if a request is
valid. It needs to be checked first if json parsing succeeded before
accessing values of it, or else an error will occur.

added street_address attribute for geocodio, updated fixture and outdated attribute tests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