Update github.rb
Update github.rb

Fixed issue #164 where the repo name was being used for the cookbook instead of the name from the cookbook metadata.
pingworks/berkshelf-api-binrepo-store,damacus/berkshelf-api,pantheon-systems/berkshelf-api,gueux/berkshelf-api,damacus/berkshelf-api,gueux/berkshelf-api,damacus/berkshelf-api,gueux/berkshelf-api,pingworks/berkshelf-api-binrepo-store,pantheon-systems/berkshelf-api,pingworks/berkshelf-api-binrepo-store,pantheon-systems/berkshelf-api