ESRI lookup now uses this method.

* Add ip-api.com (ip lookup) support

This service returns better coordinates for Europe than other free ip lookup services available in geocoder.

* Clean the results class

Remove default responses for fields.

* Remove checking fields in url query

API already handles unknown fields, so this check is unnecessary.

* Add a test for using parameters directly in search method

* Use proper domain name

Use pro.ip-api.com domain in case when api key is in use, otherwise just ip-api.com.

* Handle invalid api key

* Add forsaken fixture

* Make uniform an invalid key handler with the other geocoder lookups

* Add ip-api.com (ip lookup) support

This service returns better coordinates for Europe than other free ip lookup services available in geocoder.

* Clean the results class

Remove default responses for fields.

* Remove checking fields in url query

API already handles unknown fields, so this check is unnecessary.

* Add a test for using parameters directly in search method

No longer needed now that :yahoo lookup is gone.

TimeoutError is deprecated in Ruby 2.3.0. It has been an alias for
Timeout::Error starting in Ruby 1.8.0, and should be safe to replace.

The Yahoo BOSS Placefinder API is being discontinued.

https://developer.yahoo.com/boss/placefinder/