Updated rake deploy:audio task so mp3's have audio/mpeg content type

Previously, there was some unknown change that caused mp3's to be
uploaded with an incorrect content-type. Switching to the new 'fog'
library seems to have fixed the issue.

- Updated Gemfile, Gemfile.lock installing the 'fog' gem to interact
  with Rackspace Cloud Files and removed the 'cloudutils' gem which
  is now obsolute and unsupported.
- Updated tasks/deploy_audio.rake changing logic from the old cloud utils
  library to use the fog library instead.
Updated Chinese home page, added Chinese Radio Archives page

- Updated zh/index.html, zh/index.yaml adding Font Awesome icons
  which are used to accent the different options on the page.
  Added a new link to the Radio Archives page and minor text changes
  suggested by James Li.
- Added zh/radio/index.html Radio Archives page which generates an
  index of all audio files under zh/radio at compilation time.
Add mp3 files for Chinese broadcast on 2014-10-15,16,17