Added generic Astromatic api
Added generic Astromatic api

Since all Astromatic codes use the same general API, I added a class
that will handle any asthmatic code. However, because I might want to
improve the wrapper one day, I still left the sex, scamp, swarp, and
psfex modules.

fred3m/astro-toyz,fred3m/astro-toyz,fred3m/astro-toyz