Pickup project with unsaved changes(!). Set comments in slightly and title-case:

- Change detection of if a word is in ignored list.
- Can't believe I left this with unsaved changes!
- Rediscovered via gist.github.com/joepasq while working on NY DoT Projects app.
Add Gemfile with raspell dependency.

- Rename README to shorter `.md`.
Fix more indentation. Better ignored words input file support.

- Correct bug that newlines were never split from files of ignored words.
- Print ignored words comma separated instead of a newline for each one.
- Clean out some extraneous comments.
Switch to Gemfile in README#Install instead of `gem install raspell`:

- Replace "what's next" with "issues".
- Note .swift inclusion.
- Use bundle install instead of gem install raspell.
- Note operation without path or ignored-list-file parameters.