Add ShearWCS class and initial wcs unit tests
(#364)
Add AffineTransform WCS class
(#364)
Add UVFunction WCS class and unit tests for non-local WCS functions
(#364)
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)
Add PyAstWCS class
(#364)
Add fits.ReadFile function and simplify some of the fits implementation by separating out common steps into helper functions
(#364)
Add more (non-standard) FITS WCS types to unit tests
(#364)
Catch astropy.wcs warnings
(#364)
Add WcsToolsWCS
(#364)
Merge branch '#364a' into #364

Conflicts:
	galsim/wcs.py
Treat fits files as binary
(#364)
Make split between local and nonlocal wcs classes clearer, and add a few classes to make this work correctly
(#364)
Add some more useful functionality to the Angle and CelestialCoord classes
(#364)
Minor edit to where draw calculates the local jacobian.  Use offset to get a better position of the object.
(#364)
Add RaDecFunction and more unit tests of celestial WCS types
(#364)