[Nitro] Isolated specs bundle

[Judson Lester]

The attached patch bundle changes the way specs run so that each spec
gets it's own shot at the database - there shouldn't be any carryover,
which is pretty crucial to proper testing.  Also, Postgres is much
quieter now.

One issue with it right now is that each spec file needs to be run
individually.  If anyone can figure out why, I'd love it.
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