The latest alert is now saved.
Changed to an 'action' based alert.
Logins are now displayed properly.
Added 'logout' action and balance on 'login' action.
Separating the alert functions in alerts.rb.
Updated README to match.
Fix superfluous underscore in README.md.

I had a misconstrued notion that underscores needed to be
escaped with backslashes.
Merge branch 'varied_websocket_alerts'

This branch changes the way alerts are handled. Now you must send an
appropriate action to the 'action' parameter and its corresponding data
to the 'data' parameter.

At the moment only two actions are supported:
- login with data: user_id
- logout with data ignored