add retine loader
adds retina arrows for collapsable states
set latest retina wrapper and add high dpi loader
remove tabs
Merge branch 'develop' of github.com:divio/django-cms into develop

Conflicts:
	cms/static/cms/css/plugins/cms.placeholders.css
	cms/static/cms/css/plugins/cms.toolbar.css
Merge pull request #1808 from FinalAngel/develop

Frontend Fixes