Not working locally on npm start

[ZooeyMiller]

@finnhodgkin and I have been looking through this repo today, and run into trouble when trying to run it locally, for some reason the versions of socket.io and socket.io-client don't work with what's there.

Currently we're using v2.0.1 for both which didn't work on our machines, when we changed them to 1.7.3 for socket.io and 2.0.3 for socket.io-client it worked fine.

I would like to make a PR changing the dependencies to the aforementioned versions so people don't have this problem in future.

edit: removed bug label due to seeing in contributing repo about not adding it until issue is validated