Add chat example

chat.rb

@@ -0,0 +1,31 @@
+# Original code is at https://gist.github.com/948374
+module ChatClient
+  def self.channel
+    @channel ||= EM::Channel.new
+  end
+
+  def post_init
+    @buf = ''
+    @name = "anonymous_#{ChatClient.client_num+=1}"
+    @sid = ChatClient.channel.subscribe { |msg|
+      send_msg(msg)
+    }
+    # ...
+    ChatClient.channel << "#{@name.bold} has joined.\n"
+  end
+
+  def unbind
+    ChatClient.channel.unsubscribe(@sid)
+    ChatClient.channel << "#{@name.bold} has left.\n"
+  end
+
+  def receive_data data
+    @buf << data
+    # ...
+    while line = extract_line(@buf)
+      ChatClient.channel << "#{@name.bold}: #{line}\n"
+    end
+  end
+
+  # ...
+end