Adding eager load and lookup for runners
Adding explicit require for feature_seeds

Without the explicit require it is possible the active record tests
would not work.
Adding StubCallback

This class is useful for testing purposes only. As such it is included
in the lib directory.
Adding the runners

These were extracted from the hydra_connect_demo rails application.

The extraction was because I wasn't comfortable using the stubbed
behavior of a gem inside a separate application. In other words,
testing the boundaries was a bit odd.