Setup the database and test environment on runner creation instead of before testing

[thedrow]

Since the Such DSL does not allow using the parameters plugin yet (See nose-devs/nose2#139) I am forced to do the following:

with such.A('foo') as it:

  for foo in Foo.objects.all(): # Gets objects from real database
    @it.should("do bar for foo (#%d)" % foo.id)
        def do_bar(case):
          # use foo here
          foo.bar() # uses the test database.

  it.createTests(globals()) 

I'd rather have the database setup on runner creation if possible.