code: function findFile(name, dir) {
          dir = dir || process.cwd();
  
          var filename = path.normalize(path.join(dir, name));
          if (findFileResults[filename] !== undefined) {
              return findFileResults[filename];
          }
  
          var parent = path.resolve(dir, "../");
  
          if (shjs.test("-e", filename)) {
              findFileResults[filename] = filename;
              return filename;
          }
  
          if (dir === parent) {
              findFileResults[filename] = null;
              return null;
          }
  
          return findFile(name, parent);
      }
docs: Searches for a file with a specified name starting with
  'dir' and going all the way up either until it finds the file
  or hits the root.
  
  copied from
  https://github.com/jshint/jshint/blob/master/src/cli.js
  
  @param {string} name filename to search for (e.g. .jshintrc)
  @param {string} dir  directory to start search from (default:
  current working directory)
  
  @returns {string} normalized filename