added LaunchWithValues

[wizardishungry]

	err = r.LaunchWithValues(&roku.App{Id: "63218", Name: "Roku Stream Tester"},
		url.Values{
			"live":          {"false"},
			"debugVideoHud": {"true"},
			"url":           {"http://pmd205604tn.download.theplatform.com.edgesuite.net/Demo_Sub_Account_2/411/535/ED_HD__571970.m3u8"},
			"fmt":           {"HLS"},
			"drmParams":     {"{}"},
			"headers":       {"{}"},
			"metadata":      {`{"isFullHD":false}`},
			"cookies":       {"[]"},
		},
	)
	if err != nil {
		log.Fatal("roku.LaunchWithValues error", err)
	}