Adalight implementation based on the NeoPixel library

Change list:
1. Implement an adalight client based on the NeoPixel Library
(https://learn.adafruit.com/adafruit-neopixel-uberguide) to hadle ws2812 LED
strips
2. To change the GPIO port number for communication, change the constant
'PIN' in the source code.
    #define PIN 6
3. To change the number of used LEDs, change the constant 'NR_LEDS' in
source code.
    #define NR_LEDS 82

Signed-off-by: Joo, Young Jin <neoelec@gmail.com>