if bound is empty, allow everywhere
merge expandable/collapsable images to toolbar
this fixes restriction handling
adds full retina support
handlers are now removed automatically
fixed menu page tree open in top window
click is not required for the moment
Merge pull request #1802 from FinalAngel/develop

Fixes issues with drop in empty placeholders
show the publish button only if there are changes
Merge pull request #1804 from FinalAngel/develop

show the publish button only if there are changes
fixes issues with collapsable states
Merge pull request #1805 from FinalAngel/develop

fixes issues with collapsable states
don't group titles in page admin
fixed page admin tree js in sidebar
Merge branch 'develop' of github.com:divio/django-cms into develop