update test infrastructure to support Rubinius

Rubinius still has a few issues that prevent 100% support,
but it basically works if log rotation or USR2 upgrades aren't
required.  Tickets for all known issues for Rubinius have
been filed on the project's issue tracker.

* rbx does not support -i/-p yet, so rely on MRI for that
* "io/nonblock" is missing
* avoiding any optional Gems for now (EM, Rev, etc..)

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