code: function getVariables(configName, variableNames) {
      return Promise.all(variableNames.map(function(variableName) {
          return getVariable(configName, variableName);
      }));
  }
docs: runtimeConfig.getVariables
  
  @desc Reads a list of runtime config values
  
  @param {string} configName The config name of the variables to return
  @param {Array} variableNames The list of variable names to read
  @return {Promise} Promise that resolves an array of the variable values