add message and comment

oj/settings.py

@@ -51,6 +51,8 @@ LOCAL_APPS = [
     'submission',
     'options',
     'judge',
+    'message',
+    'comment'
 ]
 
 INSTALLED_APPS = VENDOR_APPS + LOCAL_APPS

oj/urls.py

@@ -14,4 +14,6 @@ urlpatterns = [
     url(r"^api/", include("submission.urls.oj")),
     url(r"^api/admin/", include("submission.urls.admin")),
     url(r"^api/admin/", include("utils.urls")),
+    url(r"^api/", include("message.urls.oj")),
+    url(r"^api/", include("comment.urls.oj")),
 ]