Wrong error codes

[kl3ryk]

After send pull request here - #18

Travis said that pull request is ready to merge.

This is not true because here: https://travis-ci.org/facebook/jest/jobs/25233025 (build: https://travis-ci.org/facebook/jest/builds/25233024) you can see that one of test has failed (under my windows enviroment all test has passed), and the exit code is 0.

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