hipchat.go
func (c *Client) Join(roomId, resource string) {
	c.connection.MUCPresence(roomId+"/"+resource, c.Id)
}
func (c *Client) Join(roomId, resource string) {
	c.connection.MUCPresence(roomId+"/"+resource, c.Id)
}
// Join accepts the room id and the name used to display the client in the
// room.