limit number of notifications in notifications#index

app/controllers/notifications_controller.rb

@@ -18,7 +18,7 @@ class NotificationsController < ApplicationController
   end
 
   def index
-    @notifications = Notification.for(current_user)
+    @notifications = Notification.for(current_user).limit(25)
     @group_days = @notifications.group_by{|note| note.created_at.strftime("%B %d") } 
     respond_with @notifications
   end