Infra: Test Fixtures

[ErisDS]

It seems to me that our tests should use independent fixtures.

The migrations can be run on the database as and when we are testing some aspect of the exact setup, for example testing migrations/import/export. However, I think we really should have a comprehensive set of fixtures, setup like a real populated blog, for testing data models etc.

Whilst doing this it would also be great to take a look at the fact our so-called 'api' tests actually test the data model. Perhaps rename these to model_*_spec and create an example of what a real API test might look like.

ref #483, #731

[ErisDS]

@gotdibbs - I know you wanted to take a stab at this but as we have MUCH BETTER test reliability now, I'm gonna punt it to 0.4 so we can focus on more important stuff, hope you don't mind? It's still assigned to you.

[gotdibbs]

@ErisDS No problemo, my time is pretty limited over the next seven days due to the move (one more day!) and such so that makes sense.