code: function existsCached(testPath) {
  	if (existsCache[testPath] == 1) {
  		return true;
  	}
  	if (existsCache[testPath] == 0) {
  		return false;
  	}
  	if (exists(testPath)) {
  		existsCache[testPath] = 1;
  		return true;
  	}
  	else {
  		existsCache[testPath] = 0;
  		return false;
  	}
  }
docs: caches the 'exists' results so we don't hit the file system everytime in production