The `http_client` method returns either Net::HTTP or Net::HTTP::Proxy.
The enclosing `start` block handles the proxy so there's no need to ever
use Net::HTTP::Proxy::Get.new. It's also slightly awkward to refer to
the parent object of the block (for lack of a better phrase) from within
the block.

Update readme for :maxmind to specify that it is the legacy web services.

Update readme for :maxmind to specify that it is the legacy web services not the GeoIP2 Percision Service

Force specfify ip_lookup on search, even when ip_address? fails

Fix bug in yandex results

This is not currently returned by any of the supported lookups,
but it COULD be.

Handle Bing over limit when header 'X-MS-BM-WS-INFO' is set to 1

Handle freegoip's updated response format

Store service arrays in instance variable

It makes it easier to add a custom lookup class or filter available
services by manipulating the correct service array.

Add license to gemspec