webos-image: libpbnjson=39,v2.9.1

:Release Notes:
Fix parsing negative fractional numbers with zero whole part. Whole part
was used to carry sign to the fractional part. If the whole part is
zero, the information about the sign was lost.

:Detailed Notes:
libpbnjson submissions/38..submissions/39
7e02d41 Adjust version to 2.9.1
e80704d Fix number parsing in range (-1, 0)

:Testing Performed:
MiniBAT, unit tests

:QA Notes:

:Issues Addressed:
[BHV-12121] ....
[CMB-952] CCC: libpbnjson=39,v2.9.1

Open-webOS-DCO-1.0-Signed-off-by: Anatolii Sakhnik <anatolii.sakhnik@lge.com>

Change-Id: I9be3385b4e8d1071e6d74ab4672d020c102ac584
Originally-reviewed-on: https://gpro.palm.com/58820
Reviewed-on: https://g2g.palm.com/6422
Reviewed-by: Martin Jansa <Martin.Jansa@lge.com>
Tested-by: Martin Jansa <Martin.Jansa@lge.com>
Reviewed-by: Susan Montooth <susan.montooth@lge.com>