Add re-flow rule

[purpleidea]

Many programmers like respecting line length, but also ensuring that it breaks correctly and not too early. This can happen if you don't properly "reflow" your document if you have a bad editor. I'd like to test for this.

Example:

Assuming an 80 char line length:

Hello how are
you today.

This should all fit on one line, but instead it's split way too early.

Thanks!

[purpleidea]

NOTE: It has to be able to detect if there's room for the following word to fit on the earlier line. So for example:

A quick brown fox jumped over the very lazy dog that didn't want to program
anything.

This should stay as is, since anything can't fit on the first line without blowing 80 chars.