test_round_trip_exception_  got stuck (on s390x)
Just FYI and for reference (feel free to close)... was running all the tests and they got stuck on this one

then tried to rerun this one specifically and just lead to certificate verification problem :-/

```shell
(sid_s390x-dchroot)yoh@zelenka:~/pandas$ HOME=$PWD/build  LC_ALL=C.UTF-8 xvfb-run -a -s "-screen 0 1280x1024x24 -noreset" nosetests  -s -v pandas/io/tests/json/test_pandas.py:TestPandasContainer.test_round_trip_exception_
test_round_trip_exception_ (pandas.io.tests.json.test_pandas.TestPandasContainer) ... ERROR

======================================================================
ERROR: test_round_trip_exception_ (pandas.io.tests.json.test_pandas.TestPandasContainer)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/yoh/pandas/pandas/util/testing.py", line 2259, in wrapper
    return t(*args, **kwargs)
  File "/home/yoh/pandas/pandas/io/tests/json/test_pandas.py", line 762, in test_round_trip_exception_
    df = pd.read_csv(csv)
  File "/home/yoh/pandas/pandas/io/parsers.py", line 655, in parser_f
    return _read(filepath_or_buffer, kwds)
  File "/home/yoh/pandas/pandas/io/parsers.py", line 385, in _read
    compression=kwds.get('compression', None))
  File "/home/yoh/pandas/pandas/io/common.py", line 240, in get_filepath_or_buffer
    req = _urlopen(str(filepath_or_buffer))
  File "/usr/lib/python2.7/urllib2.py", line 154, in urlopen
    return opener.open(url, data, timeout)
  File "/usr/lib/python2.7/urllib2.py", line 429, in open
    response = self._open(req, data)
  File "/usr/lib/python2.7/urllib2.py", line 447, in _open
    '_open', req)
  File "/usr/lib/python2.7/urllib2.py", line 407, in _call_chain
    result = func(*args)
  File "/usr/lib/python2.7/urllib2.py", line 1241, in https_open
    context=self._context)
  File "/usr/lib/python2.7/urllib2.py", line 1198, in do_open
    raise URLError(err)
URLError: <urlopen error [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:661)>

----------------------------------------------------------------------
Ran 1 test in 0.120s

FAILED (errors=1)
```