webos-image: Update layer pins for 2014-05-19

meta-webos as of 2014-05-19 10:02:46 -0700

6e58ef0 webos-image: libpbnjson=35,v2.7.0

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

Change-Id: I26d0b1c0e8362f3f57511676c6fc2b7787e3d51e
Reviewed-on: https://g2g.palm.com/5692
Reviewed-by: DCO Verification
Build: Susan Montooth <susan.montooth@lge.com>
Reviewed-by: Build Verification
Reviewed-by: Susan Montooth <susan.montooth@lge.com>
Tested-by: Susan Montooth <susan.montooth@lge.com>