Return correct status code to shell when tests fail.
Return correct status code to shell when tests fail.

When tests fail (due to e.g. missing feedparser), then the exit code of tests/runtests.py is 0, which is treated by shell as
success.  Patch by Arfrever Frehtes Taifersar Arahesis.

mandx/jsonpickle,mandx/jsonpickle,dongguangming/jsonpickle,mandx/jsonpickle,dongguangming/jsonpickle,mandx/jsonpickle,dongguangming/jsonpickle,dongguangming/jsonpickle