Closes #1

This using `msg` instead of `target` in the JoinCallback(Ex) seems to
work correctly

irc.go

@@ -274,9 +274,9 @@ func (c *Connection) parseMessage(line string) {
 					}
 				}
 			case "join":
-				c.addNick(target, GetNick(from))
+				c.addNick(msg, GetNick(from))
 				if c.JoinCallback != nil {
-					c.JoinCallback(from, target)
+					c.JoinCallback(from, msg)
 				}
 
 				if c.JoinCallbackEx != nil {

irc_test.go

@@ -37,6 +37,36 @@ func TestJoinChannel(t *testing.T) {
 	con.SendQuit("go-irc: Test Join Channel")
 }
 
+func TestJoinCallback(t *testing.T) {
+	con := NewConnection("irc.ouch.chat:6667", "irc-go", "irc-go", nil, []string{channel})
+	i := 0
+	con.JoinCallback = func(from, target string) {
+		i++
+		for _, x := range con.userList[channel] {
+			con.SendPrivmsg(channel, x)
+		}
+
+		if i == 3 {
+			con.SendQuit("")
+		}
+	}
+
+	go con.Run()
+
+	time.Sleep(10 * time.Second)
+
+	t1 := NewConnection("irc.ouch.chat:6667", "abc", "abc", nil, []string{channel})
+	t2 := NewConnection("irc.ouch.chat:6667", "def", "def", nil, []string{channel})
+
+	go t1.Run()
+
+	time.Sleep(5 * time.Second)
+
+	go t2.Run()
+
+	time.Sleep(10 * time.Second)
+}
+
 func TestLusers(t *testing.T) {
 	con := NewConnection("irc.ouch.chat:6667", "irc-go", "irc-go", nil, []string{channel})