Add unit test for makeSkyImage
(#364)
Make celestial version of makeSkyImage use numpy arrays so not incredibly slow.
(#364)
Fix _radec in some of the celestial wcs classes to work correctly if inputs are numpy arrays
(#364)
Make closure stuff work if closure item is a module
(#364)
Add tests of makeSkyImage for non-numpy case
(#364)
Increase magnitude of distortion in demo9 to make effect in weight image more apparent.
(#364)