num_runs and num_params is determined from the input files; not hardcoded anymore
changed to a module/function - pass in results file and param/run labels
determine K/ndim from chains; updated comments
wavelength_range argument to only plot part of the spectrum
updating documentation
interp_models returns array of -99s for unfound model; __call__ returns -inf in that case
added resolution arg; don't need unit change in interp check

Added an argument to give the data resolution if smoothing is needed.
In the interpolation check the data_wav units were being converted,
but that's unecessary because the units are converted in the previous
line.
added resolution arg; moved data wavelength unit conversion

Data wavelength array is converted to the model units in __init__
instead of at every interpolation
changed definition of output_unit
A is amps in astropy units, need AA for angstroms
properly convert spectral units
test file, from band_norm because I need it here
reload spectra as well
properly convert data flux units to model flux units (using astropy.units)
test SXD marley models if needed
Merge branch 'master' into poster_plots