change close method of engine

Source/SocketEngine.swift

@@ -163,7 +163,7 @@ public final class SocketEngine: NSObject, SocketEnginePollable, SocketEngineWeb
         }
     }
 
-    public func close() {
+    public func close(reason: String) {
         DefaultSocketLogger.Logger.log("Engine is being closed.", type: logType)
 
         pingTimer?.invalidate()
@@ -179,7 +179,7 @@ public final class SocketEngine: NSObject, SocketEnginePollable, SocketEngineWeb
         
         ws?.disconnect()
         stopPolling()
-        client?.engineDidClose("Disconnect")
+        client?.engineDidClose(reason)
     }
 
     private func createURLs(params: [String: AnyObject]?) -> (String, String) {

Source/SocketEngineSpec.swift

@@ -48,7 +48,7 @@ import Foundation
     
     init(client: SocketEngineClient, url: String, options: NSDictionary?)
     
-    func close()
+    func close(reason: String)
     func didError(error: String)
     func doFastUpgrade()
     func flushWaitingForPostToWebSocket()

Source/SocketIOClient.swift

@@ -109,7 +109,7 @@ public final class SocketIOClient: NSObject, SocketEngineClient, SocketParsable
     
     deinit {
         DefaultSocketLogger.Logger.log("Client is being deinit", type: logType)
-        engine?.close()
+        engine?.close("Client Deinit")
     }
     
     private func addEngine() -> SocketEngineSpec {
@@ -172,7 +172,7 @@ public final class SocketIOClient: NSObject, SocketEngineClient, SocketParsable
             dispatch_after(time, handleQueue) {[weak self] in
                 if let this = self where this.status != .Connected {
                     this.status = .Closed
-                    this.engine?.close()
+                    this.engine?.close("Connect timeout")
                     
                     handler?()
                 }
@@ -223,7 +223,7 @@ public final class SocketIOClient: NSObject, SocketEngineClient, SocketParsable
         reconnects = false
         
         // Make sure the engine is actually dead.
-        engine?.close()
+        engine?.close("Client closed")
         handleEvent("disconnect", data: [reason], isInternalMessage: true)
     }