code: function cleanUpPreviousConfig(location, app, callback) {
    var confRegex = new RegExp(app + ".*\\.conf");
    var removeConfig = function(fileName, rmCallback) {
      if (confRegex.test(fileName)) {
        return fs.unlink(location + '/' + fileName, rmCallback);
      } else {
        return rmCallback(null);
      }
    };
  
    fs.readdir(location, function(err, files) {
      async.forEach(files, removeConfig, callback);
    });
  }
docs: /*
  cleans up the previous configuration files
  
  @param {string} location
  @param {string} app name
  @callback {err} err