Pull in latest PyFITS changes

One difficulty this presents is that I really want PyFITS 3.2 to align with Astropy 0.3.  Because Astropy 0.3 is so close that means I may have to table some issues I was hoping to have in PyFITS 3.2.  I may have to go ahead and wrap up PyFITS 3.2 first anyways, and anything I don't have time to finish can go into PyFITS 3.3 (which will hopefully be released with less delay than 3.2 was).

Nonetheless, there are some changes in the 3.2-dev that still definitely need to be merged into Astropy.