code: function (next) {
              var source = fs.readFileSync(path.join('out', 'wiki', 'REFERENCE.md')).toString(),
                  home,
                  sidebar;
  
              // extract sidebar from source
              sidebar = source.replace(/<a name="Collection"><\/a>[\s\S]+/g, '');
  
              // remove sidebar data from home
              home = source.substr(sidebar.length);
  
              // add timestamp to sidebar
              sidebar += '\n\n ' + (new Date()).toUTCString();
  
              async.each([{
                  path: path.join('.tmp', 'github-wiki', '_Sidebar.md'),
                  data: sidebar
              }, {
                  path: path.join('.tmp', 'github-wiki', 'Home.md'),
                  data: home
              }], function (opts, next) {
                  fs.writeFile(opts.path, opts.data, next);
              }, next);
          }
docs: update contents of repository