Validators and regexes in config.yaml

[Gustavo Niemeyer]

> I'm asking because I'd like to get rid of it, for two reasons:
(...)
> As a minor, I would also like to expand the "str" type to "string",
> but that can be done in a backwards compatible way.

These two changes are reported and implemented in the following
bugs/branch, including backwards compatibility logic that will warn
authors to rename "str" to "string" timely:

https://bugs.launchpad.net/ensemble/+bug/837708
https://bugs.launchpad.net/ensemble/+bug/837710

https://code.launchpad.net/~niemeyer/ensemble/no-regex-option/+merge/73448

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Gustavo Niemeyer
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-- I never filed a patent.