Unicode encoding error on Python 3.2

As mentioned in #320 there I currently see this unicode-related error with Astropy master 79c3175206d544dc5121b52a3fd2ef7eec27eccf and Python 3.2 and 3.3 on Mac (but not Python 2.7 or 3.4):
https://gist.github.com/cdeil/cb709da1b9fba9292a2f