Added locationiq provider

README.md

@@ -457,6 +457,17 @@ The [Google Places Details API](https://developers.google.com/places/documentati
 * **Terms of Service**: http://wiki.openstreetmap.org/wiki/Nominatim_usage_policy
 * **Limitations**: Please limit request rate to 1 per second and include your contact information in User-Agent headers (eg: `Geocoder.configure(:http_headers => { "User-Agent" => "your contact info" })`). [Data licensed under Open Database License (ODbL) (you must provide attribution).](http://www.openstreetmap.org/copyright)
 
+#### LocationIQ (`:locationiq`)
+
+* **API key**: required
+* **Quota**: 6 request/second (30k req/day), then ability to purchase more
+* **Region**: world
+* **SSL support**: yes
+* **Languages**: ?
+* **Documentation**: http://locationiq.org/#docs
+* **Terms of Service**: https://unwiredlabs.com/tos
+* **Limitations**: [Data licensed under Open Database License (ODbL) (you must provide attribution).](http://www.openstreetmap.org/copyright)
+
 #### OpenCageData (`:opencagedata`)
 
 * **API key**: required

lib/geocoder/lookup.rb

@@ -23,6 +23,7 @@ module Geocoder
     #
     def street_services
       @street_services ||= [
+        :locationiq,
         :dstk,
         :esri,
         :google,

lib/geocoder/lookups/locationiq.rb

+require 'geocoder/lookups/nominatim'
+require "geocoder/results/locationiq"
+
+module Geocoder::Lookup
+  class Locationiq < Nominatim
+    def name
+      "Locationiq"
+    end
+
+    def required_api_key_parts
+      ["api_key"]
+    end
+    
+    def query_url(query)
+      method = query.reverse_geocode? ? "reverse.php" : "search.php"
+      host = configuration[:host] || "locationiq.org/v1"
+      "#{protocol}://#{host}/#{method}?key=#{configuration.api_key}&" + url_query_string(query)
+    end
+  end
+end

lib/geocoder/results/locationiq.rb

+require 'geocoder/results/nominatim'
+
+module Geocoder::Result
+  class Locationiq < Nominatim
+  end
+end
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