fix django-cluster tests so that they're picked up on django 1.6 (and fix test_dangling_foreign_keys to not fail BooleanField validation)
Delete less-1.4.1.min.js - the django site doesn't use it
remove less-1.4.1.min.js from verdantadmin too
Merge branch 'develop' of github.com:torchbox/verdant-rca into develop