Robust testing after combined loader

[wpears]

Combining the tests of loader and retriever has caused some integration issues which could have been prevented due to robust tests. Also, in a flurry of action, quite a few modules were created which need to be unit tested asap. The idea was that these weren't immediately necessary if the integration/loader-wide tests were working.. but these units tests will make tracking down bugs as they arise in the future much easier.

• ./tiger.js needs output tests
• new modules need unit tests
  • [x] handleZip
  • [x] handleCsv
  • [x] assureRecordCount
  • [x] bulkPrefixer
  • [x] connectToFtp
  • [x] createIndex
  • [x] backup
  • [x] jsonToCsv
  • [x] resolveFields
  • [x] loader-pipeline
  • [x] retriever-pipeline
  • [x] loader
  • [x] unzipFile
  • [x] makeLogger
  • [x] getTigerState

[wpears]

Closed by #133