Notificaiton.read! now required user argument.

```rb
Notificaiton.read!(current_user, params[:ids])
```

Add `POST /notifications/read` API for markup ids as read.

Author: huacnlee

app/controllers/notifications/notifications_controller.rb

@@ -11,6 +11,7 @@ def index
 
     def read
       Notification.read!(current_user, params[:ids])
+      render json: { ok: 1 }
     end
 
     def clean

test/integration/navigation_test.rb

@@ -50,6 +50,16 @@ class NavigationTest < ActionDispatch::IntegrationTest
     end
   end
 
+  test "POST /read" do
+    sign_in @current_user
+    notes = create_list(:notification, 3, user: @current_user)
+    post "/notifications/read", params: { ids: notes.collect(&:id) }
+    assert_response :success
+    notes.each do |note|
+      assert_equal true, note.reload.read?
+    end
+  end
+
   test "DELETE /clean without login" do
     delete "/notifications/clean"
     assert_required_user