Strip %comments in csv/tsv files
Closes https://github.com/CenterForOpenScience/modular-file-renderer/issues/17
Ignore unicode chars that can't be asciified in csv/tsv's
Closes https://github.com/CenterForOpenScience/modular-file-renderer/issues/106
Merge pull request #3 from mfraezz/issues/17

Issues/17&106