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!

Please put temp files in the tmp directory instead of config -- in fact, we can probably avoid having to write the data to disk at all by just doing "open(url).each_line".