Upgrade Django version to 1.5.9 Security releases issued
https://www.djangoproject.com/weblog/2014/aug/20/security/
Adds grappelli autocomplete support
Adds helper to ContainerBox model

Without this help to create a simple containerbox you need to use
second template (via include) to list the queryset objects or
the chosen objects. (Check slider-home.html on the core project)
Merge pull request #359 from mauler/master

Small code changes
Merge pull request #358 from mauler/improvement-containerbox-helper

Adds helper to ContainerBox model
Merge pull request #357 from mauler/improvement-channel-autocomplete

Adds grappelli autocomplete support