Paperetl

This release adds the following enhancements and bug fixes:

- Add dockerfile for building paperetl environment (9)
- Add component to build entry-dates.csv (18)
- Add pre-trained study design models to GitHub (19)
- Update README to correct and improve documentation (20)
- Ensure length of sections is less than max nlp length (27)

This release adds the following enhancements and bug fixes:

- Handle PDF parsing exceptions (22)
- Increase test coverage (23)
- Modify merge method to handle no update merges (24)
- Fix bug with JSON export (25)
- Fix bug with study model training (26)

This release adds the following enhancements and bug fixes:

- Add file name as source for file process (12)
- Use XML id for file figure processing (13)
- Filter duplicate ids (14)
- Build test suite (15)

This release adds the following enhancements:

- Support recursive directory processing (7)
- Improve publication date parsing (8)
- Added incremental database updates (10)
- Remove citations (11)

Minor README update to note package can be installed from PyPI

Release addresses the following:

- PDF Extraction Improvements (1) - extract additional fields from TEI XML files generated via GROBID
- Fix Windows Install issues (2)