Just a fix to the test to remove spurious failure.

Fix #172

Gh 172

More information: http://blog.travis-ci.com/2014-12-17-faster-builds-with-container-based-infrastructure/

Make Travis start build faster with Docker

Expands the ways that string values can be dumped to yaml.

Use simple scalar when possible, as before.

If simple is not possible, but single-quoted is allowed (ie, no
unprintables or escaped characters), then use that.

If there are linebreaks, and no lines have trailing or leading spaces,
then use folded or literal.  Prefer literal if all lines are below a
reasonable limit.

If neither literal nor folded are possible, then fall back to
double-quoted.

Fixes #66

Adds literal, folded, and single-quote scalar dump