Notification on comments for the author

As an Author I'd like to be notified about new comments under my article so that I know the opinion of crowds and can respond to people

Acceptance Criteria

• A menu item Notifications should be added in the upper right corner (similar to SO)
• If someone leaves a comment under user article, the owner should see a marker indicating new comments.
• Indicator should also show the number of unread comments (e.g. 28)
• When user clicks on the Notifications he should see a dropdown with the list of last 5 unread notifications ordered by Notification Date.
• Notification item should contain a text "New comment in Article_Name_First_80_chars" (the number may be higher if the font size allows that)
• When user presses a Notification Item, he is forwarded to the comment that represents that notification
• Additionally each notification item has a button to mark it as read and it gets removed from the list. The number in indicator gets decremented then.
• If user actually had more than 5 notifications and user has marked one of visible notifications as Read, then he starts to see the one he didn't see before.
• If there are several comments of the same article, then every comment represents a separate Notification Item (for now, in the future this will probably be changed)
• Mark All As Read button should be available at the bottom of the list. Should mark all unread notifications as read (not only those 5 that are shown right now).