Merge pull request #295 from andy4711/master

ckEditor not working with nuget package - fix
Upated jquery to 1.10.2 (fixes #296)
Show invisible pages when previewing affected items (fixes #300)
User node now links to user list in management UI (fixes #299)
Fixed missing action buttons when updating references (fixes #298)
Allow managing root page (fixes #301)
Include ckeditor plugin folder