Add support for CSV files using non-standard delimiters

[adamjnichols]

Tested to work with tab, pipe, hash, and others.

One thing about this that I really don't love is that the current class structure prevents the use of Option() within only the CSV object, meaning that you are able to pass an (ignored) option for --delimiter into jsonl2ts. It's not a huge issue but refactoring to correct it is.

Fixes #337

[berggren]

LGTM

[googlebot]

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[berggren]

CLA error is false. IT's a bug when you hit update branch button.