dbt test understands dependencies incorrectly

[jthandy]

ever since we hooked tests on to models, dbt test now seems to believe that tests depend on each other, not just on their corresponding models. when I run dbt test, I no longer get consistent groups of 8 tests running simultaneously, I get groups of varying sizes, seeming to indicate that tests are running in some type of dependency order. but tests do not depend on each other.

[jthandy]

@cmcarthur @drewbanin I think this is a regression--this used to work correctly prior to recent changes.

[cmcarthur]

ha! this makes sense. I'll look at it.

[drewbanin]

[cmcarthur]

Fix is in development, see #343