[webos-image]: libpbnjson=12

ca5e801 Fix test_sax unit test
2f15e0f Add null check for m_resolver in JParser::resolve
af95d9f Fix badly constructed variables in == operator function
bafdc2c Add object hierarchy sanity checking
86af3ba Fix crash in string serialization if there is a error in jschema_init
ec0e894 Add schema validation to jgen_stream

[GF-5526] CCC: libpbnjson=12

Open-webOS-DCO-1.0-Signed-off-by: Janne Hurskainen <janne.hurskainen@lge.com>

Change-Id: I2ba029b32f0bc7921b464765b8245f4bb1b48ade
Reviewed-on: https://g2g.palm.com/2253
Reviewed-by: Janne Hurskainen <janne.hurskainen@lge.com>
Tested-by: Janne Hurskainen <janne.hurskainen@lge.com>
Reviewed-by: Build Verification
Reviewed-by: Susan Montooth <susan.montooth@lge.com>