While playing with this branch I noticed that this function appears to be loading the config path relative to the current test. I would expect it to load relative to where the arrow command was run.

For example: I have a `/tests/mocha-config.json` and I always run the command from `/tests/`. I would call arrow with `arrow --engineConfig=mocha-config.json`. The problem is, my tests are in various subfolders underneath `/tests/`, so the tests are trying to load `/tests/models/mocha-config.json` and `/tests/controllers/mocha-config.json` which don't exist.