Infrastructure improvements

[ltirrell]

• reorganization to separate downloading/assembling of raw data (from CITES) from loading assembled data (stored as compressed CSV on github)
• add in additional columns to supplement missing data
  • use the ITIS taxonomy database to get Class, Family and Order classifications based off the Taxon column
• makefile to build and assemble data from CITES, as well as create a taxonomically-supplemented dataset