TeamCity API bindings

This is a simple wrapper around the TeamCity API.

Sample usage:

client := teamcity.New("myinstance.example.com", "username", "password")

b, err := client.QueueBuild("Project_build_task", "master", nil)
if err != nil {
	fmt.Printf("You're outta luck: %s\n", err)
	return
}

fmt.Printf("Build: %#v\n", b)