Fix the jobject_remove()

	* Start automatic tests for jobject with GTest.
	* Fix jobject member iteration list when jobject_remove() is called.

[GF-6967] libpbnjson: jobject_remove() spoils jobj_iterator

Open-webOS-DCO-1.0-Signed-off-by: Anatolii Sakhnik <asakhnik@luxoft.com>

Change-Id: I358332ea43b17a42e85484746e1bec5c44f48a74