Tweak to migration guide on http://socket.io website

[mikermcneil]

Hey y'all- I was poking around for where to send a PR, but looks like the website has database-hosted content. Anyways minor thing, but I wanted to be sure and leave a note about it while it was fresh on my mind:

On http://socket.io/docs/migrating-from-0-9/, we're not currently mentioning anything about the io.sockets.clients() method being deprecated.

e.g.

/Users/mikermcneil/code/sails/lib/hooks/pubsub/index.js:296
        return sails.io.sockets.clients(roomName);
                                ^
TypeError: Object #<Namespace> has no method 'clients'
  at Object.sails.sockets.subscribers (/Users/mikermcneil/code/sails/lib/hooks/pubsub/index.js:296:33)

When I get a solution sorted out momentarily, I'll post it here for anyone else who might find this issue on the googles.

[mikermcneil]

good ole stack overflow. I don't even know why I bother typing anymore

Get all connected sockets belonging to a room:

http://stackoverflow.com/a/24811267/486547

Get all connected sockets belonging to an entire namespace:

http://stackoverflow.com/a/27383947/486547

[barisusakli]

Keep in mind those solutions will not work in a multi node environment, there is ongoing discussion in this PR #1630 about bringing .clients() back

[mikermcneil]

@barisusakli thanks for the heads up, makes sense. (closing this)