work flawlessly was a nightmare). WARNING: This commit makes the web UI connect to the streaming API instead
of ActionCable like before. This means that if you are upgrading, you should set that up beforehand.

redis-backed "mentions" timeline as redundant (given notifications)

the public timeline has been using

button takes you back to getting started page

This prevents the bug where if you go "back" to the UI after navigating to
another page it loads with the old set of statuses

Also upgrade react-redux to latest version. This is a performance update