func (s *IssuesService) CreateLabel(owner string, repo string, label *Label) (*Label, *Response, error) {
	u := fmt.Sprintf("repos/%v/%v/labels", owner, repo)
	req, err := s.client.NewRequest("POST", u, label)
	if err != nil {
		return nil, nil, err
	}
	l := new(Label)
	resp, err := s.client.Do(req, l)
	if err != nil {
		return nil, resp, err
	}
	return l, resp, err
}
CreateLabel creates a new label on the specified repository.

GitHub API docs: http://developer.github.com/v3/issues/labels/#create-a-label
package github
import "fmt"
type Label struct {
	URL   *string `json:"url,omitempty"`
	Name  *string `json:"name,omitempty"`
	Color *string `json:"color,omitempty"`
}
func (l Label) String() string {
	return fmt.Sprint(*l.Name)
}
func (s *IssuesService) ListLabels(owner string, repo string, opt *ListOptions) ([]Label, *Response, error) {
	u := fmt.Sprintf("repos/%v/%v/labels", owner, repo)
	u, err := addOptions(u, opt)
	if err != nil {
		return nil, nil, err
	}
	req, err := s.client.NewRequest("GET", u, nil)
	if err != nil {
		return nil, nil, err
	}
	labels := new([]Label)
	resp, err := s.client.Do(req, labels)
	if err != nil {
		return nil, resp, err
	}
	return *labels, resp, err
}
func (s *IssuesService) GetLabel(owner string, repo string, name string) (*Label, *Response, error) {
	u := fmt.Sprintf("repos/%v/%v/labels/%v", owner, repo, name)
	req, err := s.client.NewRequest("GET", u, nil)
	if err != nil {
		return nil, nil, err
	}
	label := new(Label)
	resp, err := s.client.Do(req, label)
	if err != nil {
		return nil, resp, err
	}
	return label, resp, err
}