www/py-django: Update to 1.8.4
www/py-django17: Update to 1.7.10
www/py-django14: Update to 1.14.22

MFH: 2015Q3
Relnotes: https://www.djangoproject.com/weblog/2015/aug/18/security-releases/
Security: b0e54dc1-45d2-11e5-adde-14dae9d210b8
Security: CVE-2015-5963
Security: CVE-2015-5964