Re-enable social signaling server

[agallant]

https://github.com/freedomjs/socialrouter

Should be run somewhere, and then this line needs to point to it: https://github.com/freedomjs/freedom/blob/master/providers/social/websocket-server/social.ws.js#L24

Then these tests can be re-enabled (https://github.com/freedomjs/freedom/blob/master/spec/providers/provider.integration.spec.js#L17 and also in the freedom-for-* repos), and the broken demos will work again.

[devnix]

Right now, I've not been able to run any of the demos. It's related to this issue? Why doesn't the library give the option to use your own "discovering" server?