2.0 -- yaml export fixes, dayone fixes

[MinchinWeb]

This pull request fixes/adds:

• shlex.split on Windows (fixes Can't pass some options to vim #322, fixes shlex.split breaks on Windows paths #348)
• CLI
  • if no editor is set, running jrnl allows you to create an entry, but no prompt was being given
  • colorizes warning and error messages throughout
• improves Dayone handling:
  • moves to new-style date handling (variable length, square bracket enclosed)
• improves YAML export handling
  • only increases headings by one level
  • includes the entry's UUID (if available) in the export
  • removes lines from the entry if they only list tags

[maebert]

Wow. So much goodness in here indeed. Merging it in now, thank you!

[MinchinWeb]

@maebert , your responses get better and better! Glad to help

[lock]

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