Merge pull request #4 from michelts/master

Fix README: CACHE_NGINX_USE_LOOKUP_TABLE defaults to False instead of True
rewrite: response.{_get_content(),content}
Merge pull request #8 from torchbox/_get_content-deprecated

rewrite: response.{_get_content(),content}
Remove potential vulnerability in example nginx config.
Further nginx config security tweak.
Added 502 cache_miss handler
Merge pull request #9 from mjbrownie/master

Added 502 cache_miss handler
Merge branch 'master' into configurable_cachekey
Creates Django 1.7 migrations and move South ones to another folder.

Follow django recommendations:
https://docs.djangoproject.com/en/1.7/topics/migrations/#libraries-third-party-apps
Suggests migrate instead of syncdb, with South or Django 1.7 own method.