Turn off parallel testing on Python 3.2, where it is still occasionally
flaky.  See https://travis-ci.org/astropy/astropy/jobs/24452287
Merge pull request #2438 from mdboom/test/turn-off-parallel-32

Turn off parallel testing on Python 3.2, where it is still occasionally flaky
Change allocation in WCS.sub.

Conflicts:
	astropy/wcs/src/wcslib_wrap.c