Unittest gtfs.agencies()
Clean up testDownload and updated implementation for DatabaseTestSupport.teardown
Renamed test files names
Merge commit 'fa38de07e6767a896982c155a86bea1c95f11a3d' into feature/unittest_GTFS

* commit 'fa38de07e6767a896982c155a86bea1c95f11a3d':
  Update README.md