Upgrades CFITSIO to 3.35 and makes the necessary tweaks to the compression module so that it at least compiles and all the existing tests pass.  This does not handle support for Q format columns (large compressed images), but that can be handled in fixing https://trac.assembla.com/pyfits/ticket/159, for which this is a prerequisite.
Merge pull request #29 from embray/cfitsio-update

Upgrade vendored CFITSIO to 3.35