refactor to do sanitization more cleverly and solve a LOT of bugs
felo
readme updated with minimalist instructions
added a todo item
wip
add vector handler, slight refactor
factored out pyregion
fix ds9 script to use new mechanisms
minor refactoring and a sign error
fixed out-of-bounds starting position bug
only one global import for pvregions
remove awesome comment.
Merge pull request #16 from keflavich/ds9pvwcsfixes

Fix ds9, PV WCS