pandas import throws AttributeError: 'module' object has no attribute 'dtype'
In https://travis-ci.org/cloudera/spark-timeseries/jobs/97127307 

Compiled `numpy-1.10.2` and `pandas-0.17.1`

```
======================================================================
ERROR: Failure: AttributeError ('module' object has no attribute 'dtype')
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/travis/build/cloudera/spark-timeseries/python/.eggs/nose-1.3.7-py2.7.egg/nose/loader.py", line 418, in loadTestsFromName
    addr.filename, addr.module)
  File "/home/travis/build/cloudera/spark-timeseries/python/.eggs/nose-1.3.7-py2.7.egg/nose/importer.py", line 47, in importFromPath
    return self.importFromDir(dir_path, fqname)
  File "/home/travis/build/cloudera/spark-timeseries/python/.eggs/nose-1.3.7-py2.7.egg/nose/importer.py", line 94, in importFromDir
    mod = load_module(part_fqname, fh, filename, desc)
  File "/home/travis/build/cloudera/spark-timeseries/python/sparkts/test/test_datetimeindex.py", line 1, in <module>
    from test_utils import PySparkTestCase
  File "/home/travis/build/cloudera/spark-timeseries/python/sparkts/test/test_utils.py", line 2, in <module>
    from sparkts.utils import add_pyspark_path, quiet_py4j
  File "/home/travis/build/cloudera/spark-timeseries/python/sparkts/utils.py", line 4, in <module>
    import pandas as pd
  File "/home/travis/build/cloudera/spark-timeseries/python/.eggs/pandas-0.17.1-py2.7-linux-x86_64.egg/pandas/__init__.py", line 7, in <module>
    from pandas import hashtable, tslib, lib
  File "pandas/src/numpy.pxd", line 157, in init pandas.hashtable (pandas/hashtable.c:38262)
AttributeError: 'module' object has no attribute 'dtype'
```
