Initial version of Amtrak OIG scraper
Handle documents without a tracking number

If a document doesn't have a tracking number, use the filename (minus the
extension) for the ID instead
Merge branch 'master' of https://github.com/unitedstates/inspectors-general into amtrak
Follow year range for real
Fix file permissions
Merge pull request #23 from divergentdave/amtrak

Amtrak OIG scraper