fix the get_phoenix_photons bug from #182 (the fact that .metadata didn't exist in the library on the first pass through meant that the necessary R wasn't getting set properly)
update some docstrings and function names
update the documentation for some of the useful non-Rainbow related tools
Changes include:
get_phoenix_photonsbug from #182 (the fact that.metadatadidn't exist in the library on the first pass through meant that the necessaryRwasn't getting set properly)Rainbowrelated tools