Clean up `setup.py test --help`
Correct problems with UT1->UTC->UT1 roundtrip; add regression tests
Clarify CHANGES.rst
Merge pull request #2077 from mhvk/time-ut1-leapsec

UT1->UTC conversion wrong on leap seconds
Merge pull request #2088 from mdboom/testing/commandline-help

Clean up `setup.py test --help`
Fix read out of bounds error
Merge pull request #2097 from mdboom/wcs/read-out-of-bounds

Fix read out of bounds error in `wcs`
Merge branch 'master' of git://github.com/astropy/astropy into add-fitshead-script
Added support for EXTNAME/EXTVER HDU accessing and JSON output