Intermittent errors in test_dict_complex, test_dict_numpy_complex
Another annoying one, this time with more than one failure, but again, fail then not fail on a repeat run of the same tests.

Fails here: 

A) https://travis-ci.org/matthew-brett/scipy-stack-osx-testing/jobs/26434163
B) http://nipy.bic.berkeley.edu/builders/scipy-stack-3.4.0-wheel-requires/builds/20/steps/shell_8/logs/stdio

Message:

```
======================================================================
FAIL: test_dict_complex (pandas.io.tests.test_packers.TestNumpy)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/Users/travis/venv/lib/python3.4/site-packages/pandas/io/tests/test_packers.py", line 153, in test_dict_complex
    all(map(lambda x, y: type(x) == type(y), x.values(), x_rec.values())))
AssertionError: False is not true
======================================================================
FAIL: test_dict_numpy_complex (pandas.io.tests.test_packers.TestNumpy)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/Users/travis/venv/lib/python3.4/site-packages/pandas/io/tests/test_packers.py", line 165, in test_dict_numpy_complex
    all(map(lambda x, y: type(x) == type(y), x.values(), x_rec.values())))
AssertionError: False is not true
```

Fail A is on travis OSX 10.9 virtual machine running macports Python 3.4.1 in a virtualenv. Previous apparently identical run does not have this failure: https://travis-ci.org/matthew-brett/scipy-stack-osx-testing/jobs/26429175

Fail B is on an old clean 10.6 machine running Python.org 3.4.0.  Subsequent identical run does not fail: http://nipy.bic.berkeley.edu/builders/scipy-stack-3.4.0-wheel-requires/builds/21
