Move address into transport config

This makes it possible to use a factory function to create a transport of the right type and not having to repeat the address when calling Transport.Connect()

transport.go

@@ -5,6 +5,9 @@ import (
 )
 
 type TransportConfiguration struct {
+	// Address is the XMPP Host and port to connect to. Host is of
+	// the form 'serverhost:port' i.e "localhost:8888"
+	Address        string
 	ConnectTimeout int // Client timeout in seconds. Default to 15
 	// tls.Config must not be modified after having been passed to NewClient. Any
 	// changes made after connecting are ignored.
@@ -12,7 +15,7 @@ type TransportConfiguration struct {
 }
 
 type Transport interface {
-	Connect(address string) error
+	Connect() error
 	DoesStartTLS() bool
 	StartTLS(domain string) error
 
@@ -20,3 +23,8 @@ type Transport interface {
 	Write(p []byte) (n int, err error)
 	Close() error
 }
+
+func NewTransport(config TransportConfiguration) Transport {
+	return &XMPPTransport{Config: config}
+
+}