Get weather source attribution from server (close #43)

www/assets/js/toolbox_weather.js

@@ -57,6 +57,8 @@ function loadWeather(reload) {
                 }
                 $("#forecast-location").text(resp.location_name);
                 $("#forecast-info").text("Forecast covers the next " + resp.forecast_hours + " hours (until " + timestampToTimeString(resp.forecast_until) + ").");
+                $("#forecast-creditlink").text(resp.source.text);
+                $("#forecast-creditlink").attr("onclick", "openExternalBrowser('" + resp.source.url + "')");
             } else {
                 app.dialog.alert(resp.message, "Error");
             }

www/pages/toolbox/weather.html

@@ -44,7 +44,7 @@
                 <br />
                 <span id="forecast-info"></span>
                 <br />
-                <a href="" onclick="openExternalBrowser('https://darksky.net/poweredby/')">Powered by Dark Sky</a>
+                <a id="forecast-creditlink" href="" onclick=""></a>
             </div>
         </div>
     </div>