pushbullet.go
func NewWithClient(apikey string, client *http.Client) *Client {
	endpoint := Endpoint{URL: EndpointURL}
	return &Client{apikey, client, endpoint}
}
func NewWithClient(apikey string, client *http.Client) *Client {
	endpoint := Endpoint{URL: EndpointURL}
	return &Client{apikey, client, endpoint}
}
// NewWithClient creates a new client with your personal API key and the given http Client