Fix IA hanging issue

- Restructure fetcher files
- Incorporate task classes form internet_archive module into
  IAFetcher class
- Apply EDANFetcher parse method update in edan_fetcher.py
- Remove "statelibrarynorthcarolina" from IA
Merge branch 'develop' of github.com:dpla/ingestion into develop
Remove obsolete lib/fetcher.py