Fix bug TemplateSyntaxError at /, ref #293
Merge branch 'master' of github.com:opps/opps

* 'master' of github.com:opps/opps:
  Updated changelog with new templatetag feature
  Added extra_context to get_containerbox template tag
  Update Changelog
  Fix filter_queryset_by and exclude_queryset_by when queryset is sliced