Rate-limited status actions (per user and per user+status).
Closes #1041 (closed)
up to 15 any actions (create / delete, fav / unfav, blog / reblog) with any activities within 10 seconds (per user)
up to 3 fav/unfav or blog/reblog actions on the same activity by the same user within 60 seconds (e.g. like - unlike - like, unreblog - reblog - unreblog) — could limit to 2 actions (action and undo action), right now it's allowed to undo the undo action