volumio 2 rpi image new feature

[FishTest]

users maybe hope that these librarys can interger with volumio 2 rpi image.
1:wiringpi,so users can add adtional control to MPD,such as buttons and other i2c devices.
2:libasound2-plugin-equal and alsa-tools,users can adjust equalizer settings with alsa-mixer.
3:and a kernel patch script,so users can add custom audio card driver.