fix engineDidOpen implementation

Source/SocketEngine.swift

@@ -331,6 +331,8 @@ public final class SocketEngine: NSObject, SocketEngineSpec, WebSocketDelegate {
                 if !forcePolling && !forceWebsockets && upgradeWs {
                     createWebsocketAndConnect(true)
                 }
+                
+                client?.engineDidOpen("Connect")
             }
         } catch {
             DefaultSocketLogger.Logger.error("Error parsing open packet", type: logType)
@@ -762,7 +764,6 @@ extension SocketEngine {
             connected = true
             probing = false
             polling = false
-            client?.engineDidOpen!("Connect")
         }
     }
     

Source/SocketEngineClient.swift

@@ -30,5 +30,5 @@ import Foundation
     func engineDidClose(reason: String)
     func parseEngineMessage(msg: String)
     func parseEngineBinaryData(data: NSData)
-    optional func engineDidOpen(reason: String)
+    func engineDidOpen(reason: String)
 }

Source/SocketIOClient.swift

@@ -318,6 +318,10 @@ public final class SocketIOClient: NSObject, SocketEngineClient, SocketParsable
         }
     }
     
+    public func engineDidOpen(reason: String) {
+        didConnect()
+    }
+    
     // Called when the socket gets an ack for something it sent
     func handleAck(ack: Int, data: [AnyObject]) {
         guard status == .Connected else {return}