Merge pull request #88 from pusher/jf-expose-authenticate-method

Expose the #authenticate module on Pusher

Author: jackfranklin

lib/pusher.rb

@@ -32,7 +32,7 @@ class << self
 
     def_delegators :default_client, :get, :get_async, :post, :post_async
     def_delegators :default_client, :channels, :channel_info, :trigger, :trigger_async
-    def_delegators :default_client, :webhook, :channel, :[]
+    def_delegators :default_client, :authenticate, :webhook, :channel, :[]
 
     attr_writer :logger