Update ckeditor

GPL 3 compliant

• Already have a plugin for LimeSurvey (need update),
• Have a "placehoder" system to take inspiration :http://ckeditor.com/latest/samples/plugins/placeholder/placeholder.html
• Upload/link to file (width kcfinder)
• Image upload (width kcfinder)
• i18n
• Files upload plugin or integration :
  • kcfinder : last git move are 27 Sep 2014
  • roxyfileman
  • elFinder
  • http://ckeditor.com/addon/imgupload