The more I think about this, the more I wonder if we should use a different symbol for the date functions. Everything ActionView::Helpers::SanitizeHelper sanitizes starts with `<` as it's looking for ERB or HTML tags. Since I will be parsing for `<` sanitize becomes useless to defend us.

The only problem is I can't think of a good replacement symbol. `[` and `]` are fairly common in emails, and `{` / `}` are too hard to type on an Android keyboard. How about we drop the `show_from` method and just use `>` for `due`? Sanitize won't drop `>` if there's no matching `<`.

This also means we don't need to move the sanitize methods.