updates 'games backed up' message style in Lightsquare - light background, rounded border
changes single quotes to rs/lsquo entities in disconnected message
moves LoggedIn.fire() to User._login and checks for login details sent with
/register/success - the user is not always automatically logged in after
registering now (e.g. if they have games), in which case the data received
is 'null'.  No /login/success message is sent now.

(github - #73)
allows creating an account while logged in or playing games, in which
case the user is not automatically logged in to their new account and
a message saying this is displayed on the register success page.

(github - fixes #73)