Implemented MDC algorithm and API for both Bing/Google and MDC

	modified:   app/helpers/database_adapter.rb
	modified:   app/helpers/information_interface.rb
	new file:   app/helpers/information_providers/database_info_provider.rb
	modified:   app/helpers/information_providers/google_info_provider.rb
	new file:   app/helpers/information_providers/mdc_info_provider.rb