Implement the websocket adaptor, a version of kataras/go-websocket, and refactor all of the previous websocket examples.

https://github.com/kataras/go-websocket/issues/27

Former-commit-id: 0b7e52e0a61150a8bba973ef653986d8b3ddd26b

iris.go

@@ -70,10 +70,9 @@ type Framework struct {
 	ln             net.Listener
 	closedManually bool
 
-	once      sync.Once
-	Config    *Configuration
-	sessions  sessions.Sessions
-	Websocket *WebsocketServer
+	once     sync.Once
+	Config   *Configuration
+	sessions sessions.Sessions
 }
 
 var defaultGlobalLoggerOuput = log.New(os.Stdout, "[iris] ", log.LstdFlags)
@@ -253,19 +252,6 @@ func New(setters ...OptionSetter) *Framework {
 		}})
 	}
 
-	{
-		//  +------------------------------------------------------------+
-		//  | Module Name: Websocket                                     |
-		//  | On Init: Attach a new websocket server.                    |
-		//  |         It starts on first callback registration           |
-		//  +------------------------------------------------------------+
-
-		// in order to be able to call $instance.Websocket.OnConnection.
-		// The whole server's configuration will be
-		// initialized on the first OnConnection registration (no runtime)
-		s.Websocket = NewWebsocketServer(s)
-	}
-
 	{
 		//  +------------------------------------------------------------+
 		//  | Module Name: Router                                        |