Remplacement de plupload par dropzonejs

- Plupload removed
- cleaned javascript for file upload
- updated tinymce
- new UI inspired from Wordpress uploader
missing semicolons
Model/Media.php : UTF-8 sans BOM
remove generated files with the original extension file
Revert "Merge pull request #36 from rYsvelain/master"

This reverts commit ddc0172ee51408a06f8ead1beef3c6044c230444, reversing
changes made to 0d9d89b6badae3eadf1635068811a61a23562a0a.
Revert "remove generated files with the original extension file"

This reverts commit 5616f24480876b81dcea0c9687187d2ee11f1802.