Minor doc updates
(#364)
Correct the logic in setOrigin slightly
(#364)
Update AstropyWCS posToImage calculation to account for possibility that astropy's ra is at a different phase than world_pos's ra.
(#364)
Update demo9 comments to include UVFunction
(#364)
Update hms to always use 0..24 for the range in hours
(#364)
Change Bounds methods addBorder, expand, and shift to return new Bounds objects rather than change the original in the python layer.
(#364)
Fix WCS I/O to FITS headers so ds9 reports the correct world positions
(#364)
Add TanWCS function
(#364)
Update config wcs to work with celestial WCS types.  TanWCS in particular.
(#364)
Add TanWCS to demo11
(#364)
Add recent changes to CHANGELOG
(#364)