webos-image: Layer pins for 2013-07-17

meta-webos as of 2013-07-17 16:05:08 -0700

eb9b48d webos-image: luna-service2=151
bcdc6a0 webos-image: libpbnjson=15
883ca16 alsa-plugins: Add PACKAGECONFIG for libav, pulseaudio, jack

Open-webOS-DCO-1.0-Signed-off-by: Susan Montooth <susan.montooth@lge.com>