Implement user read marker for Stream entries

[shadyvb]

Inspired by RSS/News readers, we should track user read-entries, so we can tell later how much entries has been added since the user's last read entry.

This opens so much possibilities, which can all be tracked as individual issues if approved, some of which:

• 1. Showing unread count on Dashboard/Menu, user-based.
• 2. Sending a frequent ( daily / weekly / quota-based ) Digest email with unread entries, possibly using a specific filter.
• 3. Allowing Admins to know the last read entry by other admins/editors, and being in better position to handle unread entries and take actions. It would also help knowing the last time an admin/editor has viewed the feed.
• 4. We can have a blinking tab on new updates, if we change the page title on new updates, Chrome ( and Firefox? ) keeps flashing the tab so the user notice the update, just like Gmail and Facebook.

[lukecarbis]

Great idea. Especially point 1.

[frankiejarrett]

I'd like to narrow the scope of this idea and start with something simple. This is what I imagine: