fixes issues #2818 #2815
prevent first ajax call
partial addition to #2857
fixes #2829
changelist fixes (tree)
Merge branch 'develop' of github.com:divio/django-cms into develop
set correct _url behaviour
Merge branch 'develop' of github.com:divio/django-cms into develop
fix tests
fixes issue #2842
Merge pull request #2871 from FinalAngel/develop

Tree and Sideframe changes