fixing compatibility with new astropy0.4 coordinates API
workarounds for default-to-ICRS approach
Vizier tests fixed by checking for multiple parent class types.  1 down,
many to go
shorter CoordGenerator names, fixed IRSA
fix UKIDSS, SDSS
fix simbad.  less readable in current version, unfortunately
fix NVAS, NED.  NVAS requires an awful re hack
fix magpis
fix ned for real, and fix abuses in commons
a little more test cleanup for py3
Merge pull request #333 from keflavich/astropy0.4

Fix compatibility with astropy0.4 coordinates API