Bump faye-websocket to version 0.8.0 to fix issue when running with newe...

...r version of websocket-driver

In issue #12 it was found that when running faye-websocket 0.7.5 with websocket-driver 0.4.0, the initialize function of client.rb in websocket-driver now requires the url to be already set in the socket object, which faye-websocket was doing after creating the Driver class. Version 0.8.0 of faye-websocket fixes this as well as bumping the websocket-driver version to 0.4.0. I have tested this on multiple versions of ruby and it now works correctly.