limit user creation to admins, add notice to layout
more user limitations
user rights, timeline
add update bonbon
styles, cleaning
bug fixes
Decrescenting order for posts restored
Edit and Destroy links display only to the current signed in user
Edit and Destroy links displayed only to the current signed user
Merge branch 'jacopo' of https://github.com/trueter/Headbook into jacopo
merging jacopo to master