Run rake tasks all at once in rake dbs test for a speed up
Run rake tasks all at once in rake dbs test for a speed up

Before:

    Finished tests in 56.245787s, 0.2133 tests/s, 0.0000 assertions/s.
    12 tests, 0 assertions, 0 failures, 0 errors, 0 skips

After:
    Finished tests in 42.401416s, 0.2830 tests/s, 0.0000 assertions/s.
    12 tests, 0 assertions, 0 failures, 0 errors, 0 skips

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