Add Hydrogen delta line
Rudimentary camera response correction.
Compose extra classes
Make array of plots
Extract superclass for spectra
Add --crop flag
Add basic export of calibrated spectra
Allow calibration with know angstrom per pixel
Add FitsExport class
Add script to create colour spectra image
Remove pickles reference lookup table.

Just requires references to be in references/name.fits
Allow float for pixel calibration coordinates
Add autocrop.py script