webos-image: libpbnjson=13

:Release Notes:
libpbnjson includes corrections to a series of bug reports
surrounding object comparison, assignment, and prooperty
removal.

:Detailed Notes:
See the individual tickets

:Testing Performed:
Build verification
Automatic test suite
Smoke test on Goldfinger

:Issues Addressed:
[GF-3349] Libpbnjson: examine and fix JValue::operator==
[GF-4132] libpbnjson: original value is changed when copied
[GF-6378] libpbnjson: JValue tries to compare C strings as booleans
[GF-6379] libpbnjson: JValue::operator==(JValue) does not check objects' size
[GF-6967] libpbnjson: jobject_remove() spoils jobj_iterator
[GF-6968] libpbnjson: jobject_find() won't find a key after
[GF-7502] libpbnjson=13

Open-webOS-DCO-1.0-Signed-off-by: Keith Derrick <keith.derrick@lge.com>

Change-Id: Icf583b680936bccc5f6a3ef308150b51d6a99696
Reviewed-on: https://g2g.palm.com/2699
Reviewed-by: Anatolii Sakhnik <anatolii.sakhnik@lge.com>
Tested-by: Anatolii Sakhnik <anatolii.sakhnik@lge.com>
Reviewed-by: Build Verification
Reviewed-by: Susan Montooth <susan.montooth@lge.com>