maybe starting to edit for adding vsini and rv to the fit
Merge branch 'master' into vsini_rv
additional uncertainty term, to account for uncertain model

On the advice of Dan Foreman-Mackey, changing the calculation of
lnprob.  I'm adding an additional parameter for the fit that is
added in quadrature to the data uncertainty at each point.
account for ln(s) having no inherent unit
add additional uncertainty as a parameter in the fit
script to test adding additional uncertainty
fix astropy.units issue; comment logging.debug statements
commented logging.debug statement
debugged plots, commented out quantile plot, added errorbars to random

Was having a problem adding errorbars to the plot, fixed inputs.
Commented quantile plot because it was throwing an error and I
didn't feel like dealing with it.
Changed the format of self.all_params from np array to list, because
emcee_plot couldn't handle it as an array.
Added errorbars to the plot of random draws, representing the data
uncertainty added in quadrature to the additional error from the fit.
went back to cropping the burn-in period
modify scripts to test add'l uncertainty w/ masked FeH and splitting bands
change band definition per Kelle's email
plot best-fit ln(s), because errorbars don't obey the alpha command

plot the ln(s) value corresponding to the 50th quantile, but plot
it on the actual data.  It doesn't work to plot it on the random
draw models because the error bars don't use the alpha command, so they are all opaque and you can't see the model variations very well.
added a logging line
Merge remote branch 'origin/unc_param' into unc_param
better variable names in makemodel
check which computer we're on
xlabel is microns, not angstroms
plot uncertainty on bottom of random plot; quantiles on corner plot

Plot uncertainty spectrum at bottom of a spectrum plot (as opposed
to making an errorbar plot), and the random draws of ln(s) added to
the data uncertainty will be plotted transparently at the bottom
as well.
I also added quantiles to the triangle.corner call in plot_triangle
editing triangle to use gridspec