Assigning inf and nan as header values simply shouldn't be allowed for now, as this is undefined by the FITS standard (and the previous behavior was nonsensical anyways).  Later this will be allowed optionally.

git-svn-id: http://svn6.assembla.com/svn/pyfits/trunk@2192 ed100bfc-0583-0410-97f2-c26b58777a21
Added changelog entries for spacetelescope/PyFITS#11

git-svn-id: http://svn6.assembla.com/svn/pyfits/trunk@2195 ed100bfc-0583-0410-97f2-c26b58777a21
Add a changelog entry for this fix.
assert_raises -> pytest.raises
Merge pull request #954 from iguananaut/fits-merge

Error when storing IEEE NaN & Infinity in FITS header keywords