Prepare a report for the bulk normalizer files

[gaurav]

As of PR #564, we have a directory on stars.renci.org containing TSV files that will be automatically downloaded and normalized at the end of every Babel run. The goal here is to use that list to track large-scale normalization goals (e.g. all of NodeAnnotator or NodeSynonymizer). The final step will be to prepare a simple report based on that list of files so we know what proportion of identifiers could and could not be normalized, so we can track how close we're getting to full coverage.