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!

Thanks, Esme. I'm not sure if there is some network concern if do those operations such as read each line, split each line to token and push it to array over the network?  That's the reason I wrote the whole file to a local tmp file first. What do you think?