Python 3 failure with test_query.py

[migueldvb]

There is a failure when using python 3 caused because astroquer.vizier.Vizier returns bytes instead of strings in some columns and the assertions in test_query.py fail.

======================================================================
FAIL: Testing with first entry from Gaia DR1 TGAS table
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Traceback (most recent call last):
  File "/usr/lib/python3.5/site-packages/nose/case.py", line 198, in runTest
    self.test(*self.arg)
  File "/home/miguel/Gaia/isochrones/isochrones/tests/test_query.py", line 14, in test_queries
    assert tm.get_id() == '03000819+0014074'
AssertionError: 
-------------------- >> begin captured logging << --------------------
root: WARNING: PyMultiNest not imported.  MultiNest fits will not work.
requests.packages.urllib3.connectionpool: DEBUG: Starting new HTTP connection (1): vizier.u-strasbg.fr
requests.packages.urllib3.connectionpool: DEBUG: http://vizier.u-strasbg.fr:80 "POST /viz-bin/votable HTTP/1.1" 200 3558
--------------------- >> end captured logging << ---------------------

----------------------------------------------------------------------
Ran 1 test in 0.986s

FAILED (failures=1)

[timothydmorton]

Just getting around to doing some isochrones cleanup, including testing everything with py3. I just pushed a fix to this onto master.