Added support for what3words

Added new geocoder provider for what3words

Control.Geocoder.js

@@ -666,6 +666,67 @@
 	L.Control.Geocoder.mapbox = function(access_token) {
 			return new L.Control.Geocoder.Mapbox(access_token);
 	};
+
+
+	L.Control.Geocoder.What3Words = L.Class.extend({
+		options: {
+			serviceUrl: 'http://api.what3words.com/'
+		},
+
+		initialize: function(accessToken) {
+			this._accessToken = accessToken;
+		},
+
+		geocode: function(query, cb, context) {
+			//get three words and make a dot based string
+			L.Control.Geocoder.getJSON(this.options.serviceUrl +'w3w', {
+				key: this._accessToken,
+				string: query.split(/\s+/).join('.'),
+			}, function(data) {
+				var results = [], loc, latLng, latLngBounds;
+				if (data.position && data.position.length) {
+					loc = data.words;
+					latLng = L.latLng(data.position[0],data.position[1]);
+					latLngBounds = L.latLngBounds(latLng, latLng);
+					results[0] = {
+						name: loc.join('.'),
+						bbox: latLngBounds,
+						center: latLng
+					};
+				}
+
+				cb.call(context, results);
+			});
+		},
+
+		suggest: function(query, cb, context) {
+			return this.geocode(query, cb, context);
+		},
+
+		reverse: function(location, scale, cb, context) {
+			L.Control.Geocoder.getJSON(this.options.serviceUrl +'position', {
+				key: this._accessToken,
+				position: [location.lat,location.lng].join(',')
+			}, function(data) {
+				var results = [],loc,latLng,latLngBounds;
+				if (data.position && data.position.length) {
+					loc = data.words;
+					latLng = L.latLng(data.position[0],data.position[1]);
+					latLngBounds = L.latLngBounds(latLng, latLng);
+					results[0] = {
+						name: loc.join('.'),
+						bbox: latLngBounds,
+						center: latLng
+					};
+				}
+				cb.call(context, results);
+			});
+		}
+	});
+
+	L.Control.Geocoder.what3words = function(access_token) {
+		return new L.Control.Geocoder.What3Words(access_token);
+	};
 
 	L.Control.Geocoder.Google = L.Class.extend({
 		options: {