Allow the use of non-local ReadMe files in the CDS reader
Documentation of the CDS reader class updated
General documentation updated with an example of the load of CDS tables using URLs
sip_pix2foc should subtract crpix and the end, and sip_foc2pix should do
the inverse.
Added support for inputting units
Added test for units and corresponding data file
Removed unnecessary statement
Added support for inputting column description as well
Included test file in setup_package
Changed SExtractor test to include a description check
fix a bug in format_input where output scalars were not returned correctly. Convert all models in projections.py to use format_input.
add a test
Made SExtractor regex verbose, enhanced test and test file
Added changelog entry
Merge branch '3.2-stable' into astropy

Incorporates up through aa78ac3ad54441cf247e8f32ef32dd685a05c6fc

Conflicts:
	.authors
	docs/source/conf.py
	lib/pyfits/_release.py
	setup.cfg

Conflicts:

	.authors
	astropy/io/fits/card.py
	astropy/io/fits/fitsrec.py
	astropy/io/fits/hdu/table.py
	astropy/io/fits/header.py
	astropy/io/fits/tests/test_checksum.py
	astropy/io/fits/tests/test_core.py
	astropy/io/fits/tests/test_table.py
Added a changelog entry--not copying all the changes just mentioning that they were ported.
izip_longest is called zip_longest in Python 3
Fixed a couple small issues that only came up on Python 3. The one in hdulist affected all Python versions, however, in that HDUList.writeto did not immediately close the output file when done in the common case of the file being provided as a filename
Fix one of the failing tests reported in #2290

The download_file() call displays a progress bar by default so make sure
the expected output reflects that.  Use a time range actually supported
by the IERS_A table in the example of setting t.delta_ut1_utc.
Fix external C API for astropy.wcs