Added a multi-strand test with both RGB and RGBW LEDs.
Added a multi-strand test with both RGB and RGBW LEDs.

jgarff/rpi_ws281x,weidnerm/pi-ws2812,tykune21/rpi_ws281x,weidnerm/pi-ws2812,jgarff/rpi_ws281x,weidnerm/pi-ws2812,Margravegit/rainbowraceway,weidnerm/pi-ws2812,tykune21/rpi_ws281x,jgarff/rpi_ws281x,weidnerm/pi-ws2812,Margravegit/rainbowraceway,tykune21/rpi_ws281x,Margravegit/rainbowraceway