- download_fms_fixies is now Py2/3 compatible and updated to 2016
  python code rather than 2013; added argparse for specifying start
  and end dates on the command line; no more hand-rolled datetime
  stuff, and no more hard-coded holidays (thx to arrow and holidays)
- added and pinned arrow and holidays deps to requirements file

(hope to god i didn’t introduce any errors)

Also loaded resources properly, so file handles are closed
automatically.

- Expanded and standardized CLI args for download and parse fms fixies
modules
- CLI defaults now only download or parse fms fixies that haven’t
already been downloaded or parsed
- Made parser into python package, to enable relative imports within
modules
- Bumped arrow version requirement

- continued putting the pieces together in
download_and_parse_fms_fixies CLI
- better logging and empty result handling in downloader and parser
- tweaked CLI arg names for data dirs and shifted default end dates
back one day
- utils.get_daily_csvs_by_date() keys now arrow objects, just like
utils.get_fixies_by_date()

- added table keys and db table names to constants
- default startdate now 8 days prior to today rather than earliest
possible date; seems like default shouldn’t be “run over every single
thing available”
- restructured daily_csvs_by_date dict; now nested dict by table name
rather than tuple of filenames
- bumped pandas version requirement

- add logger to utils module, to prevent bug
- add csv text stuff to constants, temporarily
- clean up the readme a bit

- Improve logging messages / levels throughout parser code
- I changed my mind: make default start date be the earliest available
date, but in practice, defaults will only get the new stuff
- Update run.sh and reset_data.sh scripts to use new parser CLI
-