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This is an effort to vastly decrease the time it takes to run a single
unit test file and therefore increase productivity and happiness for
people working on this project.

If you want to run a unit test file, now you can use `zeus rspec`
instead of `rspec` -- assuming you run `zeus start` first -- and it will
run a LOT faster.

Because test files tend to have long file paths, you can even use a
shorter version of those paths. So instead of saying:

    zeus rspec spec/unit/shoulda/matchers/active_record/validate_uniqueness_of_matcher_spec.rb

you can say:

    zeus rspec active_record/validate_uniqueness_of_matcher_spec.rb