Add AID.
Remove unused import
Interpolate env variables in Python, shell=False
Add testimony and semiannual reports.
Add NLRB.
First version.
Add NSF.
Add RRB.
Add NCUA.
Consistent spacing.
Audit reports working.
Semiannual reports working.
Add congressional testimony.
Add Postal Regulatory Commission
Add HEAD requests against report urls for --dry_run.
Fix report url getting.
Switch to using res.ok to allow for 301, 302, etc.
Merge pull request #125 from unitedstates/dry-run-head-requests

Add HEAD requests against report urls for --dry_run
make sure all shell=False commands use arrays of strings
Merge pull request #111 from unitedstates/no_shell_2

Take two, shell=False