piprensents: cosmetics
pp_videoplayer: reindent exit in def terminate
pp_omxdriver: add _process property
pp_gpio: add pp_gpio wrapper to support rpi and wiringpi2 library
add gpio_cb.cfg for cubieboard
gpio.cfg: rename to gpio_rpiv1.cfg
add pp_mpvdriver for mpv player
py_gpio: mention cubieboard pin layout in comments
switch to video-/audioplayerdriver
pp_mplayerdriver: add video_position for conistency with other drivers
pp_audioplayer: don't set the audio device in the audioplayer
pp_videoplayer: add pp_mpvdriver as a comment