Via Tender: Block/delete user from timeline & mark as spam

Assigned to Tender issue #25. As reported in Tender:

I fly pretty low on twitter, and this has happened to me a couple of times, so I'm pretty sure it's happened to everyone: some new spammer comes up and tweets something at you with a toxic link and maybe a pornographic icon... and even after you've reported and/or blocked the user on twitter proper, the message still shows up in your spaz timeline.

I'd really like to have a feature so that you can just select a tweet that spaz has already picked up and delete it. Thanks!