code: function init(options) {
  		setting = options || {};
  
  		if (!setting.googleApiKey && !setting.yandexApiKey) {
  			console.warn(constant.ERROR.MISSING_TOKEN);
  			return false;
  		} else if (setting.yandexApiKey) {
  			serviceType = constant.YANDEX_NAME;
  			translateSrv = require('./service/yandex.js');
  		} else {
  			serviceType = constant.GOOGLE_NAME;
  			translateSrv = require('./service/google.js');
  		}
  
  		translateSrv.init(setting);
  		return true;
  	}
docs: init - Initialize the setting of your module instance, it takes a setting object
  
  @param  {Object} options
  @return {boolean} indicate if the module is configured properly