Angle documentation crashes Ipython

I've noticed an odd failure mode that seems to be due to #1006 : If I start up Ipython (0.13.1) and type ``astropy.coordinates.Angle?``, ipython crashes with an exception in the pager that says 
``UnicodeEncodeError: 'ascii' codec can't encode character u'\xb0' in position 508: ordinal not in range(128)``.  I presume this is due to the degree signs that are now in the `Angle` documentation... Any ideas on how this might be worked around?

This does *not* happen in the dev version of ipython... But we probably count on our users having that.

@mdboom as the author of #1006