Failures with developer version of Numpy

There are (and have been for a little while) test failures with the latest dev versions of Numpy:

https://jenkins.shiningpanda.com/astropy/job/astropy-master-debian-py2.7-numpy-dev/1211/testReport/

@taldcroft - these concern the ``astropy.table`` and ``astropy.io.ascii``, so would you mind looking into them?