PubSub protocol support (#142)

* PubSub protocol support
Added support for :
- XEP-0050   (Command))
- XEP-0060   (PubSub)
- XEP-0004   (Forms)

Fixed the NewClient function by adding parsing of the domain from the JID if no domain is provided in transport config.
Updated xmpp_jukebox example

* Delete useless pubsub errors

* README.md update
Fixed import in echo example

* Typo

* Fixed raw send on client example

* Fixed jukebox example and added a README.md

_examples/xmpp_chat_client/interface.go

@@ -136,7 +136,11 @@ func writeInput(g *gocui.Gui, v *gocui.View) error {
 	input := strings.Join(v.ViewBufferLines(), "\n")
 
 	fmt.Fprintln(chatLogWindow, "Me : ", input)
-	textChan <- input
+	if viewState.input == rawInputWindow {
+		rawTextChan <- input
+	} else {
+		textChan <- input
+	}
 
 	v.Clear()
 	v.EditDeleteToStartOfLine()