Get Netfile ETL scripts running on Heroku

[daguar]

Either @ted27 or me will do this -- whoever gets to it first.

Comes from discussion here: #24

Remaining to-do's here are:

• Either replace unzip with Python code (DG preference) or get unzip buildpack working
• Combine @ted27's Heroku setup work with @daguar's updates
• Confirm it works, and set up job
• Adding code to upload to an S3 bucket (pending setup, in @daguar's court, which is issue #31)

[daguar]

This may be unnecessary, since I've got Vagrant running an Ubuntu VM on Lauren's PC now!

Documenting steps here:
daguar/netfile-etl#2

[daguar]

I'm closing this for now since we have the scripts running on Lauren's computer; we can reopen if we decide Heroku is a more sustainable path.