Can you comment as to how to test for multiple versions of Backbone using our test suite? Assuming this would be outside of bower and we want to test against exactly 1.0 so maybe grab a hard copy of 1.0 and pull it into the repo?

All `_configure` did before was set `this.options` which we don't do anyway. Now Backbone 1.1 doesn't either. So this is actually much closer to Thorax.