v0.1.0: Delimiter choice and a form

This version has all the most basic features I sought to include:

1. Choice of no delimiter (better performance but chunk boundaries will cut across lines) or the delimiter of your choice.
2. A user-friendly form for navigating the chunks found so far.
3. The ability to view previews of each chunk.
4. No glaringly obvious bugs.

The stretch goals (editing, more complex delimiters like being able to chunk JSON files) may be included in a future release.