gst/: name objects by default, not in gst_element_factory_create. Allows using elements created with g_object_new. (f...

Original commit message from CVS:
* gst/gstelementfactory.c: (gst_element_factory_create):
* gst/gstobject.c: (gst_object_init),
(gst_object_set_name_default), (gst_object_set_name):
name objects by default, not in gst_element_factory_create. Allows
using elements created with g_object_new. (fixes #167283)