Ignore .rvmrc files
Merge branch 'mark/rvm_utilities' into development
Add facebook config to app
  - config/facebook.yml is the file
  - however, it's ignored for security reason. Copy config/facebook.yml.sample for structure
  - Adjust readme: write about facebook.yml + .rvmrc for environmental vars
Merge branch 'mark/move_facebook_config_to_yml' into development