Unify input screen with results, parse atf, local server, heroku

[wanderingstan]

Sorry this PR looks scarier than it is! 😬

• Show cuneiform on same screen as input, so one can quickly cuneify multiple texts
• Don't error out for single bad token in UI (underlying py code still behaves same, tho)
• Core python parsing function returns structured data; text formatting handled at higher abstraction
• Be smart about atf files, only parsing tokens after line number
• Ability to run server locally for testing
• Ability to serve on standard WSGI server, like heroku (with needed Procfile)
• .gitignore
• Updated readme with example usage both CLI and web

Everything should be compatible with the existing mws environment, but of course I can't test that. :)