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Scientist - Test new code against old.

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<a href=https://travis-ci.org/lancew/Scientist><img src=https://api.travis-ci.org/lancew/Scientist.svg></a>
<a href=https://coveralls.io/github/lancew/Scientist><img src=https://coveralls.io/repos/lancew/Scientist/badge.svg></a>
<a href=https://metacpan.org/pod/Scientist><img src="https://badge.fury.io/pl/Scientist.svg"></a>
<a href=https://github.com/lancew/Scientist/issues><img src=https://img.shields.io/github/issues/lancew/Scientist.svg></a>

