Add a Node platform implemenation of NodeOutputTestRunnerContext.
Add a Node platform implemenation of NodeOutputTestRunnerContext.

Given a list of search paths and a concrete implementation of OutputTest, creates an OutputTest for each ".test" file in those search paths. Expected output should be a sibling file for each ".test" file with the ".expected" extension. Progress is reported via the console.

paulymer/CRISP-8