Add notification for Tempmark

Merge pull request #4 from Hykwtakumin/takuminPR

通知周りの処理を追加してみた

Delete notification and some fix

Merge pull request #3 from Futahei/dev

delete notification

Test

Usage

You can temp-bookmark the web page by Ctrl+B.
Also you can select and delete the temp-bookmark in popup html.

This may have a lot of bugs, thank you.