Added Gauss Hermite PSF documentation
Merge branch 'gauss_hermite_psf' into dev with docs
Added GaussHermitePSF; still debugging whether it works
fix index order to match Julien's files
update Gauss Hermite PSF docs
Merge branch 'gauss_hermite_psf' into dev
Checkpoint on initial refactor to legendre xy
Converted PSFs to use Legendre polynomials for xy; updated tests to match change in options
Merge branch 'legendre_xy' into dev; changes PSF format
correct doc about PSF spot reference pixel (corner vs. center)
Merge branch 'dev' into multi_input
Stupid fits format pads strings with spaces, messing up objtype.  Strip whitespace.
Add --sky option; fix units in sky template
Merge branch 'multi_input' into dev to get --sky option
update doc about new xy vs w format
Fixed bug in xyrange when asking for wavelength ranges that cover the CCD but extend off of it
minor reformatting and comments
Merge branch 'dev' into gauss_hermite_psf
Produces spots, but they dont look like Juliens spots yet
Working with Juliens new double Gauss Hermite format