Feature/rake task

Esme,
You could run: rake authorities, which should do the following jobs:
- Create config/authorities directory.
- Pull countryInfo.txt from genome.org
- Extract the wanted information
- Write to YAML file according to QA required format.
Thanks for reviewing!

It should be fine to pull the data directly from the http request.  If the http retrieval fails, then the task will fail no matter what.  Once the data is retrieved, then working with in memory won't need to do any more network requests.