CriticTester | Critic extension for automatic testing

To install the extension in a Critic system, a user would create a directory named CriticExtensions in his/her $HOME, and clone the CriticTester repository into that directory. If done correctly, the file $HOME/CriticExtensions/CriticTester/MANIFEST should exist. Also, $HOME should be world executable, and $HOME/CriticExtensions should be world readable (and directories executable) for the Critic system to be able to find and use the extension. For more information about Critic extensions, see the [extensions tutorial] [tutorial]. This tutorial is available in any Critic system that is sufficiently up-to-date to have extension support. [critic]: https://github.com/jensl/critic "Critic on GitHub" [tutorial]: http://critic-review.org/tutorial?item=extensions "Extensions tutorial".