Require 'sound-notification' store to be included in the build

Author: Emmanouil Konstantinidis

src/js/stores/notifications.js

@@ -6,6 +6,8 @@ var Actions = require('../actions/actions');
 var apiRequests = require('../utils/api-requests');
 var SettingsStore = require('../stores/settings');
 
+require('../stores/sound-notification');
+
 var NotificationsStore = Reflux.createStore({
   listenables: Actions,
 

src/js/stores/sound-notification.js

@@ -58,7 +58,7 @@ var SoundNotificationStore = Reflux.createStore({
         self.playSound();
       }
       if (showNotifications) {
-        self.showNotification(countNew, response, latestNotification);
+        this.showNotification(countNew, response, latestNotification);
       }
     }