Minor directory structure rearrangement in prep for adding example WCS fits files.
(#364)
Change Angle wrap function to return a new Angle rather than change the existing Angle object.
(#364)
Add two helper functions for parsing HMS and DMS angles (from strings)
(#364)
New CelestialCoord class to encapsulate (ra,dec) position on sky
(#364)
Implement minScale and maxScale for AffineTransform
(#364)
Implement AstropyWCS and first pass at corresponding unit tests (more needed)
(#364)