Fix the railtie

The commit ae3826f339509638b2b31f608c3eeb3136946aa8 to raise or log unpermitted parameters has broken the railtie.

* The initializer before which the config parameter should have been set was not properly named.
* the `options` variable name isn't available in 3.2. We need to call `app.config`.

This fixes the railtie making it possible to run the edge version of the repository with 3.2.