updated mocha
updated mocha
fixed typo
some changes

- removed private function tests
- appended tests
reworte functions

- removed private functions
- changed to fs.open/fs.close/fs.mkdir from fs.exists
removed NODE_ENV in test npm-script
replaced to license from License
appended changes to HISTORY.md
changed version to 0.3.3
release for version 0.3.3