Tidy `README.md`.

Not going to get any tidier now that all docs have been moved to GitHub
Pages pages generated by Edify.

Closes #92.

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index.js                 16120/15.74  5474/05.35  3584/03.50  2012/01.96
Remove `jump`.

Closes #143.
Closes #108.

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index.js                 15677/15.31  5326/05.20  3506/03.42  1952/01.91
Test with Node.js domains.

Closes #96.

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index.js                 15677/15.31  5326/05.20  3506/03.42  1952/01.91
Remove equality test for try/catch.

Closes #146.

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index.js                 15412/15.05  5260/05.14  3467/03.39  1929/01.88
Release 0.0.25.

Closes #151.

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index.js                 15412/15.05  5260/05.14  3467/03.39  1929/01.88
Upgrade Proof to 0.0.33.

Closes #152.

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index.js                 15412/15.05  5260/05.14  3467/03.39  1929/01.88
Submit coverage to S3 from Travis CI.

Closes #154.

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index.js                 15412/15.05  5260/05.14  3467/03.39  1929/01.88
Try to fix s3sync on Travis CI.

See #154.

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index.js                 15412/15.05  5260/05.14  3467/03.39  1929/01.88
Ship coverage to web server instead of S3.

See #154.

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index.js                 15412/15.05  5260/05.14  3467/03.39  1929/01.88
Notes on error propagation.

I'm adding these notes here and in Strata, because they pertain to both.
Tidy `package.json`.
Whitespace tidy.
Spell check diary.
Whitespace tidy `README`.
Return no error argument if no arguments.

Return no error argument if there are no actual arguments to return to
the callback.

I'm doing this in lieu of being explicit about whether an early return
returns `null` or `undefined`. An API test framework is asserting that
no arguments are returned for a specific case, no errors or other
values, and it is doing this by testing if the error value is the same
as `undefined`.

In my source I'm invoking `step(null)`, but that does not propagate. The
null returned to the callback is not the same null that was given to
`step`. I can see now that `step(undefined)` is not the right way to go.

Closes #155.
Release 0.0.26.

Closes #156.
Boolean indicates loop termination on truthiness.

Closes #158.
String indicates a property assignment.

Closes #157.
Release 0.0.27.

Closes #159.
Notes on loop termination.