Geolocation update for peer sync

-freegeoip.app now requires an api key so the peer sync has been updated to use reallyfreegeoip.org instead
-Added extra error checking to the peer sync so that it will error out when the geolocation service does not return a proper object

lib/explorer.js

@@ -975,7 +975,7 @@ module.exports = {
   },
 
   get_geo_location: function(address, cb) {
-    request({uri: 'https://freegeoip.app/json/' + address, json: true, headers: {'User-Agent': 'eiquidus'}}, function (error, response, geo) {
+    request({uri: 'https://reallyfreegeoip.org/json/' + address, json: true, headers: {'User-Agent': 'eiquidus'}}, function (error, response, geo) {
       return cb(error, geo);
     });
   },