def url=(url)
      uri = URI.parse(url)
      @scheme = uri.scheme
      @app_id = uri.path.split('/').last
      @key    = uri.user
      @secret = uri.password
      @host   = uri.host
      @port   = uri.port
    end
def url=(url)
      uri = URI.parse(url)
      @scheme = uri.scheme
      @app_id = uri.path.split('/').last
      @key    = uri.user
      @secret = uri.password
      @host   = uri.host
      @port   = uri.port
    end
Configure Pusher connection by providing a url rather than specifying
 scheme, key, secret, and app_id separately.

 @example
   Pusher.url = http://KEY:SECRET@api.pusherapp.com/apps/APP_ID