jgm/CommonMark — pull request #247 by cirosantilli (2014-12-21 11:25:33+00:00)
Title: Add --number option to run a single test by its id

Do not check input validity, e.g. input `>` number of tests, because
other inputs don't check it either, e.g. `--pattern`.

If given, the summary line will be like:

1 passed, 0 failed, 0 errored, 509 skipped