Improve check_toc rule in Makefile

[jtraglia]

This PR is a little update which makes the check_toc easier to understand. Here's what it looks like:

(note, these screenshots were take with a mistake & don't list _features files)

Specifically, this PR does the following:

• Check all files instead of stopping at the first difference.
• Hide unnecessary command output & print simple good/bad message with color.
• Tell reader there's a saved tmp file.

[ralexstokes]

sounds good, nice work!

[hwwhww]

Good Good Good.