Run a single test from a parameterized testclass by setting an environment variable.

See [this question on stackoverflow](http://stackoverflow.com/questions/16517300/junit-parameterized-tests-how-do-i-run-only-1-specific-test-from-intellij-eclip).

It seems there's no way to do this. If there's a way, it should be documented on the parameterized testclass wiki.
