Fix #2559: Make equivalencies work correctly with compose.
Add another compose-to-equivalencies example.
Fix tests
Remove support for Numpy 1.5.x
Reinstate something that shouldn't have been removed.
Re-word CHANGES entry.
Reinstate some of the workarounds for Py3 on io.fits
Improved consistency of FK5 <-> Galactic conversion with other codes and with FK5 <-> FK4 <-> Galactic route.
Fix tests
Fix remaining tests
Fix frame attribute inheritance in SkyCoord.transform_to
Update CHANGES.rst
Further cleanups
Further cleanups
Update docstring per suggestion from @eteq [skip ci]
Wording improvement suggested by @eteq
Use FLOAT_CMP
Add one more test of attribute inheritance
Merge pull request #3107 from astrofrog/fk5-galactic

Fix FK5 -> Galactic conversion
Merge pull request #3106 from taldcroft/coordinates-attrs

Fix frame attribute inheritance in SkyCoord.transform_to