Unmaintained [Tinhte] HTML5 Uploader (Unmaintained) 1.0.3

- Fix missing files bug
- Update PlUpload to lasted version (2.1.7)

Fixed "Cancel button" bug.
Remember to clear browser file cache to refresh js file (attachment_editor.js)

Please review this if you like it.

Workaround for a Plupload bug - additional buttons (like Preview, Quick review) were not displayed correctly.