Making work on Windows by using `path.resolve`.

lib/codex/utils/fs.js

@@ -23,11 +23,9 @@ exports.mkdir = function (_path, mode, callback) {
  _path = path.resolve(_path);

  function _mkdir(p, next) {
    var _p = path.normalize(p).split('/');

    path.exists(p, function (exists) {
      if (!exists) {
        _mkdir(_p.slice(0, -1).join('/'), function (err) {
        _mkdir(path.resolve(p, '..'), function (err) {
          if (err) next(err);
          fs.mkdir(p, mode, function () {
            next(null);