Fix checksum tests on 32-bit systems.
Remove unnecessary np.array()
Change order of arguments for `wcs.compare`.
Revamped coordinates getting started for APE5 scheme
Update separations for APE5
Fix typo in test_api -> test_api_ape5
initial reorganization of coordinates docs for APE5
tweaks to angles.rst
reorganized match/sep stuff
add todo noe in formatting.rst
more APE5 reorganization
overview for APE5 and associated changes
further APE5 doc updates
sphinx warning fixes
Documentation for representation classes
Fix function signature in docs.
Fix #2514: Fix warning message when config option moved to top-level.
Update old 'whatsnew' pages to just link to the versions of those pages in the docs for those versions, which will always be properly rendered for their associated Astropy release.  Left the 0.1 one alone, as there was never really a 'whatsnew' page in Astropy 0.1
Add changes entry.
Fix some minor formatting issues in the documentation.  In some lines on the
examples the commented lines were not prefixed by >>> where it was in other
cases.  I've make all to be after the >>> so it's formatting properly and not
as an output.