Using custom yaml config parser.

The 'config' module I was using wasn't operating the way I like, so I used one that I built myself and use on other Node.js projects. It will allow config overrides if a config-{USER}.yaml file exists, which allows API credentials to be stored in a file that never gets checked into source control.
Merge pull request #1 from rhyolight/config-refactor

Using custom yaml config parser.